Kenyon 3550 Mast Section

Atlantic; Antares K Main; Balboa 26; Bech 25; Black Tie; Cal 25; CF-27; Contessa 26; Columbia 259; DM Tradition 26; Ericson 21.8, 25; Evelyn 26OD; Grampian 26; Hunter 25, 25.5; Lancer 25; Meridian; O'Day 25, 26, Dolphin, 32K Mizzen; Pearson Triton 27; Ranger 23; Roberts 24, 25; Rodgers 26; Seidelman 25; South Coast 25; S-2 7.3, 8.0B; Thunderbird 25; US-27; Viking; See Also: Kenyon Spars 3550 Boom

Kenyon 3550 Mast Section 3550 Mast Section - Clear Anodized: K-X3550CA-___: 3550 Mast Section - Raw: K-X3550R-___: Kenyon 3550 Section Mast Tube is stocked in a variety of lengths (listed above) fully anodized or raw (mill finish), it can also be cut to shorter lengths. To order, specify length. Sections can also be milled for the sailgate or other components, painted finishes and other lengths are available on special order, Please specify. If you require a complete Mast Assembly, you can select from components below and contact us with specifications.

3550 Standard Mast Hardware Listed below are parts specific to the Kenyon 3550 Mast Section. For more generic parts, see Kenyon Exit Blocks, Kenyon Exit Plates, Kenyon Shroud Tangs, and other categories listed under Kenyon Spar Parts. There are many parts for specific configurations that are not listed here. If you require 3550 Mast Components not listed here please contact us with details.

Mastheads Listed below are standard mastheads for the Kenyon 3550 Section. A variety of Custom Mastheads are available as well, please inquire. Tapered masts normally use welded-in mastheads for maximum strength with minimum weight. Most 3550 Mastheads are normally supplied with *K-198-7P* Nylatron sheaves for use with rope. Aluminum sheaves, K-198-7A, are available for use with wire. Mastheads work optimally with 3/8" or smaller halyards.
Masthead Assembly for Masthead Rig - Aluminum Sheaves: K-1800:
Double channel extruded aluminum Masthead Assembly for 3550 mast section incorporates (4) sheaves, K-198-7A, for internal or external rope halyards of all types up to 3/8" diameter. Includes slotted SS toggles with 5/16" pins (K-1659) for headstay and backstay attachment, and topping lift pin. Masthead fits in 2 7/16" x 1 3/8" wide slot cut into fore & aft sides of the mast tube. Sheave axle/Topping lift Pin (1/4") is K-10563, Toggle support Pin (5/16") is K-RP5-44. Use with Masthead Cap *K-9946* (order separately). Pre-drilled for attachment of Spinnaker Halyard Bail *K-1422* (order separately). Channel is 9 7/8" long, and attaches to the mast with (2) 1/4" bolts.
	Masthead Sheave - Aluminum: K-198-7A: Anodized Aluminum Sheave for use with wire or rope. Sheave is 1 3/4" OD x 31/64" wide x 3/8" ID, and rides on Bronze Bushing *K-9523,* for use with standard 1/4" axle.
	Masthead Sheave - Delrin: K-11881: Light weight Plastic Sheave for use with rope. Sheave is 1 3/4" OD x 31/64" wide x 3/8" ID, and rides on Bronze Bushing *K-9523,* for use with standard 1/4" axle.
	Masthead Sheave Bushing: K-9523: Sintered Bronze Sheave Bushing measures 3/8" OD x 1/4" ID x 1/2" long, for use on standard 1/4" axle.
	Spinnaker Halyard Bail: K-1422: SS plate is welded to 1/4" bail. Designed for use with Kenyon 1 3/8" wide double channel Masthead Assembly. Attaches with (2) #10 x 1/2" screws and locknuts.
	Mast Head Cap: K-9946: Mast Head Cap for 3550 fastens to top of any Kenyon inset single or double channel mastheads, to seal mast end, and provide a flat mounting surface. Cap size is slightly larger than 3550 mast section. Aluminum with black epoxy finish.
Fractional Masthead w/ Single Sheave: K-10934-1: Single channel extruded aluminum Masthead Assembly for 3550 mast section incorporates (1) Nylatron sheave, K-198-7P, for internal main halyard, and backstay crane with 5/16" pin. Includes 1/4" pin for topping lift attachment. Masthead fits in 2 7/16" x 3/4" wide slot cut into fore & aft sides of the mast tube. Use with Masthead Cap K-9946 (order separately). Channel is 10 1/2" long, and attaches to the mast with (2) 1/4" bolts.
Fractional Masthead w/ Two Sheaves: K-10934-2: Single channel extruded aluminum Masthead Assembly for 3550 mast section incorporates (2) Nylatron sheaves, K-198-7P, for use with internal or external main halyard, and backstay crane with 5/16" pin. Includes 1/4" pin for topping lift attachment. Masthead fits in 2 7/16" x 3/4" wide slot cut into fore and aft sides of the mast tube. Use with Masthead Cap K-9946 (order separately). Channel is 10 1/2" long, and attaches to the mast with (2) 1/4" bolts.
	Mast Head Cap: K-9946: Mast Head Cap for 3550 fastens to top of any Kenyon inset single or double channel mastheads, to seal mast end, and provide a flat mounting surface. Cap size is slightly larger than 3550 mast section. Aluminum with black epoxy finish.
Masthead Ass'y for Mizzen Mast: K-1800MZ: Heavy-duty Masthead specially designed for Mizzen Mast applications using the 3550 mast section. Unit incorporates extruded aluminum channel with (2) aluminum sheaves, K-198-7A, in cast housing with dual SS strap. SS strap has 3/8" hole (upper) for Triatic Stay turnbuckle and 1/2" hole for attachment of Mizzen Staysail halyard block. Two sheaves allow for internal or external Mizzen halyard. Includes 3/8" pin for backstay attachment, and 1/4" topping lift pin. Masthead fits in 2 7/16" x 3/4" wide slot cut into fore and aft sides of the mast tube. Masthead is 8 1/2" long (less strap) x 3 1/2" wide, and is attached to the mast with (6) 1/4" screws, and a 3/8" bolt. ###
	Masthead Sheave - Aluminum: K-198-7A: Anodized Aluminum Sheave for use with wire or rope. Sheave is 1 3/4" OD x 31/64" wide x 3/8" ID, and rides on Bronze Bushing K-9523, for use with standard 1/4" axle.
	Masthead Sheave Bushing: K-9523: Sintered Bronze Sheave Bushing measures 3/8" OD x 1/4" ID x 1/2" long, for use on standard 1/4" axle.

*Stainless Steel Jib Box Ass'y for 1/4" Pin: K-84030:* Internal SS Jib Box Assembly for fractional rigs combines 2 sheaves and integral forestay attachment nose in one compact, low-windage unit. Unique design allows both halyards to be used for jibs and/or spinnakers. Aluminum sheaves for wire or rope will handle halyards up to 5/16" diameter. Assembly fits in mast cutout 2 1/2" high x 1 1/8" wide, and fastens with (8) #10 (3/16") fasteners. Used successfully on boats in the 21' to 26' range, unit has 1/4" hole for forestay attachment.
*Stainless Steel Jib Box Ass'y for 5/16" Pin: K-84030L:* As K-84030, above, but with reinforced 5/16" hole for forestay attachment. K-10885
*Aluminum Jib Box Ass'y w/ 5/16" Pin: K-11591A:* Cast aluminum internal Jib Box Assembly with 5/16" pin and 5/16" Forestay Toggle. Unit combines 2 sheaves in an over/under configuration, with an integral forestay attachment pin in one compact, narrow and lightweight unit. Dedicated Spinnaker and jib halyards are both well shielded from the 5/16" forestay pin. Features heavy-duty Nylatron Sheaves: (1) 2" Sheave for Spinnaker Halyard, K-11638; and (1) 1 1/2" Sheave for Jib Halyard, K-11595. Sheaves are 1/2" wide for snag free handling of halyards up to 3/8" diameter. Assembly fits in mast cutout 5 1/2" high x 7/8" wide, and fastens with (4) #10-24 machine screws (included). Internal mounting flange is slightly curved to fit a variety of masts. Assembly is designed to fit through the mounting slot and is then fastened from the outside. Forged Chrome Bronze Toggle, MER 5770-410, is included. Unit measures 8" long x 7/8" wide and projects 1 3/4" inside of mast. Suitable for use with a variety of mast sections on boats with forestays up to 3/16" diameter. A-4
*Aluminum Jib Box - 3 Sheaves w/ 5/16" Pin: K-11590A:* Identical to K-11591A, above, but jib halyard (lower) sheave is replaced with 2 narrow sheaves and a dividing plate. Nylatron jib halyard sheaves, K-11593, are 1 1/2" diameter x 7/32" wide, and suitable for use with wire up to 5/32" diameter, and line up to 3/16". Jib halyard sheaves are mounted on special removable axle, making it easy to lead halyards. As used on Evelyn 26.

Bow Light Base Pad (round): K-9356-1: Black urethane mounting pad provides low-profile mount for K-11019 (or Perko 5686) bow light. Molded to fit 3550 mast section, pad is 2 3/8" diameter and fastens to mast with (3) #8 screws.
Bow Light (round): K-11019: When mounted vertically on K-9356 Base Pad the K-11019 functions as a 20 point Bow/Steaming/Masthead Light. When mounted horizontally on top of mast it functions as a 360 degree all-around anchor light. Round base is 2 3/8" diameter and fastens with (3) #8 screws. Requires 3/4" hole for socket. 12-volt light uses GE # 90 bulb (included).

Spreaders The Kenyon 3550 mast section is normally used with 1 1/8" OD round spreaders or with Kenyon SP-2.2 airfoil spreaders, which measure 1 7/8" (fore and aft) x 3/4" (vertically). In special applications SP-3 airfoil spreaders are used. For Spreader details, or to order replacement Spreaders, see Kenyon Spreader Sections.
Spreader Bases The Kenyon 3550 mast section uses a variety of Spreader Bases (Brackets) and Spreader Bars to suit different applications. Standard Spreader Bases and Spreader Bars are listed below.
*Spreader Base for 1 1/8" Round Spreaders: K-968:* SS welded Spreader Bracket Assembly for 3550 mast section. Formed plate has welded socket to fit Kenyon 1 1/8" OD Round Spreaders. Teardrop shaped plate measures (maximum) 3 3/8" high x 2 1/2" wide, socket projects 2 1/4" (maximum) out from mast wall. Attaches to the mast with (7) 3/16" (#10) screws or rivets and (1) 3/8" bolt that also fastens the lower shroud tang. Spreader is held in socket using vertical 3/16" screw and nut or cotter pin. Used for rigs with in-line spreaders, base has 5-degree vertical lift. D40429 +3
*Large Round Spreader Bracket - Port: K-1567-2P:* *Large Round Spreader Bracket - Starboard: K-1567-2S:* SS welded Spreader Bracket Assembly for 3550 mast section. Formed plate has welded socket to fit Kenyon 1 11/16" OD (K-2130) Round Spreader. Design allows for recessed attachment of lower shroud tang. Plate is 3/32" thick and measures 3" high x 4 1/4" long to spread loading over a larger area. Attaches to the mast with (6) 3/16" (#10) screws or rivets and a 5/8" bolt, or a 3/8" bolt and a K-9631 Flange Bushing to reduce weight, or when used with K-1492, K-1493, or K-1494 Tang Assemblies. Used for rigs with in-line spreaders, base has 5-degree vertical lift. Specify port or starboard. 4960 D40443
Spreader Bracket for SP-2 Spreader - 0° aft, Port: K-10418-3P: Spreader Bracket for SP-2 Spreader - 0° aft, Starboard: K-10418-3S:
SS welded Spreader Bracket Assembly for 3550 mast section. Formed plate has welded stud to fit Kenyon SP-2.2 Spreader. This strong fitting reduces windage to a minimum. Plate measures 3" high x 4 1/4" long to spread loading over a larger area and attaches to the mast with (8) 3/16" (#10) fasteners. For in-line spreaders. As used on Evelyn 26, Lancer 25, and others.
*Spreader Bracket for SP-2 Spreader - 7° aft, Port: K-10418-P:* *Spreader Bracket for SP-2 Spreader - 7° aft, Starboard: K-10418-S:*
Spreader Bracket Assembly is as K-10418-3, but with studs angled for spreaders swept 7 degrees aft.
Spreader Bracket for SP-3 Spreader - 15° aft, Port: K-11547P: Spreader Bracket for SP-3 Spreader - 15° aft, Starboard: K-11547S:
Large Spreader SS welded Bracket Assembly for 3550 mast section. Formed plate has welded stud to fit Kenyon SP-3 Spreader, at 15 degrees aft. This strong fitting reduces windage to a minimum. Plate measures 3" high x 4 1/4" long to spread loading over a larger area and attaches to the mast with (8) 3/16" (#10) fasteners. As used on Hunter 25.5.
Spreader Bars For High Performance applications designers frequently specify Kenyon thru-bar spreader systems. These systems have been proven through many years of top-level racing, and are now the norm on most racing yachts. Standard spreader bars for the 3550 section and Kenyon SP-2.2 airfoil spreaders are listed below. Other angles are available on a special order basis.
*Spreader Bar for SP-2.2 Spreader - 0 degree aft: K-11777:* Anodized aluminum Spreader Bar is used on the 3550 mast section with Kenyon SP-2.2 Spreaders. Installed through a slot in the mast, the bar is held in place by the spreaders. Has 5-degree vertical lift. For rigs with in-line spreaders, 0 degree aft.
Spreader Bar for SP-2.2 Spreader - 6° aft: K-11777-6: As K-11777, but angled for spreaders swept 6 degrees aft.
Spreader Bar for SP-2.2 Spreader - 10° aft: K-11777-10: As K-11777, but angled for spreaders swept 10 degrees aft.
Spreader Bar for SP-2.2 Spreader - 15° aft: K-11777-15: As K-11777, but angled for spreaders swept 15 degrees aft.
Spreader Bar for SP-2.2 Spreader - 17.5° aft: K-11777-17: As K-11777, but angled for spreaders swept 17.5 degrees aft.
Spreader Bar for SP-2.2 Spreader - 20° aft: K-11777-20: As K-11777, but angled for spreaders swept 20 degrees aft.
Spreader Bar Plate Kit for 3550 Mast: K-11882-3K: Formed SS Reinforcing Plates have rectangular slot to fit all standard SP2.2 Spreader Bars, K-11777 series, above. SS plates reinforce Mast and prevent wear and elongation of slot in mast where Spreader Bar passes through. Plates are 3" long x 1 3/4" high with rectangular slot and fasten to mast with (4) 3/16" (#10) fasteners. Kit includes 2 plates (port & starboard), (8) 3/16" SS rivets, and installation instructions - Spreader Bar from K-11777 series, above, must be ordered separately.

Mast / Spinnaker Eye: K-85783-1: For attachment of whisker or spinnaker pole on the front of the mast. Used where vertical adjustment of inboard pole end is not required. Heavy duty ring is welded to SS plate curved to fit 3550 mast section. Ring is 5/16" x 1 3/8" ID. Plate is 2 1/2" square and fastens with (6) 3/16" (#10) fasteners.
Winch Pad for 3550: K-10639: Black Urethane Winch Pad is 3 7/8" diameter, and molded to fit on centerline of 3550 section. Pad insulates winch from spar wall and properly seats it for mounting. Pad is attached to mast with 1 screw, clearance holes for screws to mount winch are then drilled through pad, winch mounting holes are drilled and tapped in spar wall. w/3H
Spar Cleat - 5" long: D-10325: Cast Aluminum Spar Cleat is a low-profile design with a narrow base suitable for use with line up to 1/2" diameter. Black Epoxy coated Cleat is 5" long, and fastens to spar with (2) 7/32" (#12) FH screws on 1 1/2" centers. See also, other Kenyon Spar Cleats.

*Main Sail Gate: K-1807K:* SS gate assembly covers 1 1/2" entrance for sail slide. When closed, allows slides to pass by gate and remain in mast. Slot allows gate to be slid aside when thumbscrew is loosened, and still remain attached to mast. Formed SS plate is 1" high with slot for SS thumbscrew, K-45 (included). Installation requires drilling and tapping (1) 10-32 hole.
	Stainless Steel Thumb Screw: K-45: SS Thumbscrew for use with Kenyon Mainsail Gates. SS Thumbscrew has a 10-32 thread and is 1/2" long (under head).
*3/4" Sail Slide Stop: K-10424:* SS Spring Pin Sail Slide Stop fits all mast sections with track for 3/4" internal flat slides. Superior design allows Slide Stop to remain captive in mast track. Gate cutout (1 3/4" high) is made just 1" above SS Gooseneck bracket. Spring pin fits in 1/4" hole drilled at top of cutout, and slides down into recess beneath Gooseneck Bracket when Spring pin is pulled. This design allows sail slides to come as close as possible to the gooseneck while remaining in track, and eliminates problems associated with slides snagging while going past a normal sail gate. Plate is 2 1/2" long with a 1/4" spring pin.

Gooseneck Bracket for 1" Toggle: K-902: Used with Kenyon "D" section and smaller booms, this SS welded Gooseneck Bracket fits standard Kenyon 1" SS Toggle, K-1993, with 1/4" vertical pin. Fastens to 3550 mast section with (6) 3/16" (#10) fasteners. Base is 2 1/2" vertical x approximately 2 3/4" wide.
	Gooseneck Toggle - 1": K-1993: Used with the *K-902* gooseneck bracket, and Kenyon "D" section and smaller booms, this SS toggle measures 1" square x 1 1/8" long. Takes 1/4" vertical and horizontal pins.
*Gooseneck Bracket for 1 1/2" Toggle, 1/4" Pin: K-10554:* Designed for use with *K-10518* Gooseneck Toggle/Tack Assemblies for D-Section and 2333 Booms, this SS welded Gooseneck Bracket takes a 1/4" Vertical pin, CP4-61K, and has clearance for a 1 1/2" Toggle. Fastens to 3756 Mast Section with (6) 3/16" (#10) fasteners. Base is 2 1/2" vertical x approximately 2 3/4" wide. 3756
	*Gooseneck Pin, 1/4" for 1 1/2" Toggle: CP4-61K:* Clevis pin is 1/4" diameter x 1 7/8" long, for use with K-10554 Gooseneck Bracket.
	*Gooseneck Toggle/Tack w/ Reef Hooks: K-10518A:* Used with the K-10554 gooseneck bracket, and Kenyon 2333 or "D" section boom, this combination Toggle/Tack/Reef Hook Assembly features 3 tack positions and includes 3/8" tack fastpin, *K-10399.* Takes 1/4" vertical pin and 3/8" horizontal pin. Two 1/4" reef hooks allow for ease of reefing from either side of the boom. Toggle portion is 1 1/2" high x 11/16" wide with 1" between pin centers. Unit (excluding Reef Hooks) is 4" high x 11/16" wide x 2 1/4" long.
	*Gooseneck Toggle/Tack Ass'y: K-10518N:* As K-10518A, above, but without reef hooks. This combination toggle and tack assembly features 3 tack positions and includes 3/8" tack fastpin, K-10399. Takes 1/4" vertical pin and 3/8" horizontal pin. Toggle portion is 1 1/2" high x 11/16" wide with 1" between pin centers. Unit is 4" high x 11/16" wide x 2 1/4" long.
	*Gooseneck Toggle/Tack Ass'y: K-10518E:* As K-10518N, above, but modified to increase the Tack Setback by 1". Toggle portion is 1 1/2" high x 11/16" wide with 1" between pin centers. Takes 1/4" vertical pin and 3/8" horizontal pin. Toggle fits all Kenyon Mast Brackets and a variety of Gooseneck Slides designed for a 1 1/2" Toggle with a 1/4" vertical pin. Toggle portion is 1 1/2" high x 11/16" wide with 2" between pin centers. Unit is (maximum) 4" high x 11/16" wide x 2 7/8" long. Specially for use with Gooseneck Slide for 3/4" Internal Flat Track, PP M6A, and as used on the Freedom 25.
	Tack Fastpin for K-10518 Toggles: K-10399: SS Fastpin is 3/8" diameter x 7/8" long. Used in all K-10518 1 1/2" Toggle/Tack/Reef Hook Assemblies.

*Gooseneck / Vang Bracket for 3/8" Pin: K-10395:* Designed for use with the *K-10345* Gooseneck Toggle/Tack Assembly for E-Section and larger Booms, this SS welded Bracket takes a 3/8" Vertical pin, CP6-76K, and has clearance for a 1 1/2" Toggle. Fastens to 3550 Mast Section with (8) 1/4" (6mm) fasteners. Base is 5" vertical x approximately 2 3/4" wide. Can also be used as Vang Bracket with addition of appropriate Vang Toggle, below. 3756
*Gooseneck / Vang Bracket for 3/8" Pin w/ Bail: K-10395B:* Designed for use with the *K-10345* Gooseneck Toggle/Tack Assembly for E-Section and larger Booms, this SS welded Bracket takes a 3/8" Vertical pin, CP6-76K, with clearance for a 1 1/2" Toggle, and includes 5/16" Bail for attachment of mainsheet block or vang tackle. Fastens to 3756 Mast Section with (8) 1/4" (6mm) fasteners, Base is 5" vertical x approximately 2 3/4" wide. Also used as a Vang Bracket with addition of appropriate Vang Toggle, below. 3756
	*Vertical Gooseneck Clevis Pin - 3/8": CP6-76K:* Vertical Clevis Pin for use with *K-10395* Gooseneck/Vang Bracket. SS pin is 3/8" diameter with 2 3/8" grip length.
	*Gooseneck Toggle/Tack w/ Reef Hooks: K-10345A:* Used with *K-10395* gooseneck bracket, this combination Toggle/Tack/Reef Hook Assembly features 3 tack positions and includes 3/8" tack fastpin, K-10557. *Takes 3/8" vertical and* horizontal pins.** Two reef hooks allow for ease of reefing from either side of the boom. Toggle portion is 1 1/2" high x 7/8" wide with 1" between pin centers. Unit (excluding Reef Hooks) is 4" high x 7/8" wide x 2 1/4" long. Attaches directly to any of the Kenyon SS Gooseneck Brackets designed for a 1 1/2" Toggle with 3/8" vertical pin. Fits E section, 3550, and 3756 standard boom goosenecks.
	Tack Fastpin for 1 1/2" Toggle: K-10557: SS Fastpin is 3/8" diameter x 1" long. Used in all K-10345 1 1/2" Toggle/Tack/Reef Hook Assemblies.

Vang Bracket, non-pivoting: K-11240: Formed base plate has welded vertical triangle (non-pivoting) with 1/2" diameter hole for attachment of vang tackle block. Fastens to 3550 mast section with (6) 3/16" (#10) fasteners. Base is 2 1/2" vertical x approximately 2 3/4" wide.
Boom Bail - 3/8" x 3 1/2" wide: K-2172: Heavy SS Boom Bail made from 3/8" rod is designed to be attached with (1) 3/8" SS bolt and nut. Formed at 3 1/2" wide, width can be varied to fit larger or smaller sections. Bail length, from bolt center, is 3 1/2". For use with 3550 Section.
	Boom Bail Bolt Ass'y - 3/8" for 3550: K-2172BA: Boom Bail bolt assembly includes 3/8" SS bolt x 4 1/2", with locknut and nylon washers to prevent bail from damaging boom surface as it pivots.
*Vang Toggle: K-10963:* Used with the *K-10395* Gooseneck Bracket, above, this SS toggle results in a fully pivoting vang bracket to minimize working stresses. Large 3/4" horizontal hole allows for attachment of any shackle or block.
*Vang Toggle w/ 14mm Pin hole: K-10963-2:* Welded SS Vang Toggle for use with the *K-10395* Gooseneck Brackets with a 3/8" Pin. SS tube is 1 1/2" long with Bronze bushed hole for 3/8" Vertical Pin. Welded SS Tab is 5mm (3/16") thick and projects 2 3/8" (60mm) out from tube. Tab has 14mm (9/16") hole for attachment of Vang and 8mm (5/16") hole for attachment of Vang Tackle. As used with Sparcraft Pneuvang and others.
*Vang Toggle for Hard Vang: K-11788:* Used with the *K-10395* and other Kenyon Gooseneck Brackets with a 3/8" Pin, this SS toggle has (1) 9/16" (14mm) hole for Vang attachment and (3) 5/16" (8mm) holes for blocks. As used with Sparcraft Pneuvang and others.
Vang Toggle for Rigid Vang – Special: A variety of semi-custom Toggles, or Bracket/Toggle combinations are available to fit rigid (or solid) vangs produced by a number of manufacturers. Please specify manufacturer, model and Pin size.

Electrical Access Plate: RR 72-99: Electrical Access Plate is designed to allow access to internal electrical plugs above the mast step, without having to unstep the mast. Saves much in frustration and money by allowing you to check mast wiring connections with the mast up. SS Plate is 4 1/2" x 2" and is designed to cover a 3" x 1 1/4" vertical slot in the side of the mast, just above the top of the mast step. Plate is slightly curved to fit a variety of mast sections and attaches with (4) 1/4-20 RH machine screws (included).

Mast Step Casting: K-9886: Mast Step for 3550 fastens to deck, keelson, or to K-1374 Mast Hinge Assembly for use as tabernacle. Unit is (maximum) 4 7/8" long x 3 1/2" wide x 2 1/4" high, and drilled for attachment to K-1374 Hinge. Cast in 356 Aluminum with black epoxy finish.
Mast Step Casting, Angled: K-10327: Mast Step for 3550, as K-9886 (above), but with bottom milled so that mast angles 5 degree aft when mast step is on flat surface, or so mast is vertical when mast step is on 5 degree angled deck. As used on O'Day 25 and O'Day 26.
Mast Step Casting w/ Slot: K-10326: Mast Step for 3550, as *K-9886* (above), but milled for use with *K-11205* 4-sheave exit block. Both sides have 1 1/2" flush cutout, on centerline, casting is undrilled.
Mast Step Casting - Fully Machined: K-11544: Mast Step for 3550, as K-10326 (above), but fully machined for attachment to K-1374 Mast Hinge Assembly.
Hinged Mast Step Ass'y: K-1806: Hinged tabernacle assembly for 3550 section allows for easy mast-stepping. Consists of K-9886 Mast Step casting bolted to K-1374 Mast Hinge Assembly.
Hinged Mast Step Ass'y, Angled: K-1840: Hinged tabernacle assembly for 3550 section incorporates a 5 degree aft angle. Designed for use on a deck with 5 degree forward slope. Consists of *K-10327* Mast Step casting bolted to K-1374 Mast Hinge Assembly. As used on O'Day 25 and O'Day 26.
Hinged Mast Step Ass'y w/ 4-Sheave Exit Block: K-11545: As K-1806, above, but with a 4-sheave exit block assembly for use with up to 4 internal halyards. Halyards (2 ea. port & starboard) may be lead up to cleats on the mast, or out at 90 degree across the deck. Consists of K-11544 Mast Step casting with K-11205 4-sheave exit/turning block, bolted to K-1374 Mast Hinge Assembly. For 3550 Mast.
	4-sheave Exit Block for 3550 Mast Step: K-11205-4A: Four-sheave exit block assembly for use with up to 4 internal halyards, bolts to 3550 Mast Step (K-10326 or K-11544). Halyards (2 ea. port & starboard) may be lead up to cleats on the mast, or out at 90 degree across the deck. Unit is (maximum) 4 7/8" long, and fits in mast cutout 1 3/8" wide x 2 1/2" high, and includes (4) Aluminum sheaves, K-198-7A for use with wire or rope.
*Halyard Organizer Plate: K-1374HP:* Halyard Organizer Plate is designed to fit under the K-1374 Mast Hinge Assembly, using the same deck bolts. New-style formed SS Plate has a total of fourteen (14) 1/2" holes on 4 sides for attaching halyard turning blocks, boom vang, and halyard shackles. Base is 7 1/2" long x 4" wide and mounts with (4) 5/16" bolts on 4 1/4" x 2 3/4" hole centers. Plate measures 8 1/2" x 5 3/4" overall and can also be drilled for use with any mast step up to 4" wide.
*Mast Step Base Plate Adapter: K-10868KP:* Mast Step Base Plate Adapter converts standard mast step for use with external adjustment screws, on keel-stepped rigs. Fastens with (2) 5/16" FH screws in standard holes of E, 2740, 3049, 3350, 3550, 3656, and other Kenyon mast steps. Allows for precise positioning without unstepping the mast. Anodized aluminum plate is 5/16" thick and is 8 1/2" long x 5" wide. Fastens to keelson with (4) 3/8" bolts in Slots that allow for 1 1/2" adjustment. Slot centers are 3 5/8" athwartships, and 5 3/4" fore & aft.

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Spars, Rigging, and Hardware for Sailboats