One Design Parts

Stainless steel clevis pin - 1/4" x 1/2" with 3/8" grip length.  Commonly used for the ILCA Harken Vang Lower Base Unit vang tang pin (to connect the vang lower unit to the tang on the lower mast section).

Selden 40mm fiddle block with hook, cam & eye. Currently used on the RS Tera & RS Zest as the standard supply for the kicker unit. Specification: Weight: 218g Safe Working Load: 250kg Breaking Load: 500kg Max Line Size: 7mm Adjustable arm with...

Selden Aluminium Tiller Extension Supplied with Selden UJ fitted Used on boats such as the RS Aero, RS Tera, and RS Feva Material: Aluminium Length: 1.1m RS Sailing Part # RSM-FO-913

Upgrade your ILCA lower mast section with this Hi-Load vang tang from Selden with this complete uprade kit. This innovative fitting is 100% stronger than the previous design, with virtually no increase in weight—a breakthrough that significantly...

Upgrade your ILCA lower mast section with this Hi-Load vang tang from Selden. This innovative fitting is 100% stronger than the previous design, with virtually no increase in weight—a breakthrough that significantly enhances both performance...

Optimist adjustable maststep with reinforced cup. This cup is improved in several key areas to make it more durable: The base and the round part of the cup are both thicker, increasing from 1.5 mm to 2 mm. The weld between the cup and the threaded...

Reinforced cup for the Optimist mast step. This version is improved in several key areas to make it more durable: The base and the round part of the cup are both thicker, increasing from 1.5 mm to 2 mm. The weld between the cup and the threaded section...

Airbag buoyancy aid for Optimist Sailboats from Colie. These Optimist buoyancy bags are made of polyurethane coated nylon and are about half the weight and significantly stronger than buoyancy bags made of PVC or PVC coated nylon. Buoyancy bags are...

Airbag buoyancy aid for Optimist Sailboats from Colie. These Optimist buoyancy bags are made of polyurethane coated nylon and are about half the weight and significantly stronger than buoyancy bags made of PVC or PVC coated nylon. Buoyancy bags are...

Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Zim Applications ISCA Race...

This 1/4 inch quick pin allows for the detachment of the ILCA vang body from the mast to be quick and easy. Works on both Harken and Ronstan ILCA vang lower units. The push lock ensures that the pin stays put on even the roughest days. This pin is...

This sticker acts as a guide, allowing you to hoist and trim the sail to the proper level on an Optimist sailboat. Use Blue for Silver / Quicksilver Optimist masts Measures position of sail relative to the mast and boom