One Design Parts

Low-friction Micro blocks are compact and lightweight. They are ideal for lightly loaded control lines on boats of all sizes. Zim Applications C420: vang cascade and 2:1 control, centerboard uphaul Club Opti: sprit halyard   Harken Part # 224A LP...

Low-friction Carbo AirBlocks® are lightweight, strong, reliable—and affordable. These small, compact blocks have very high working loads for safe, easy trimming. Zim Applications C420/CFJ: spin sheet block, outhaul block on boom   Harken...

Angled wedge for Harken cam cleats. 1-1/2" hole spacing Zim Applications: C420 jib cleat wedge   Harken Part # 145L

Eyestrap for the C420 main sheet ratchet block.   Harken Part # 137.1

Stamped shackles are used on most Harken small boat blocks. Harken Part # 072.100U LP Part # 91205

Made of durable, flexible PVC, stand-up boots holdblocks up without snagging lines. Fits 40 mm and 57 mm blocks  Zim Applications Opti: mainsheet block Harken Part # 369

Dynamic Type 6 dolly for the Optimist and other pram sailboats. Proudly made in the USA by Dynamic Dollies and custom sized for your boat, offering a great fit ease of maneuvering. Shipped in an easy to assemble kit. Upgrade to larger tires (18" x 9.5")...

Standard two hole eyestrap as used on the C420 cunningham, outhaul lead block, ILCA eyestrap, etc.   Harken 073 Eyestrap - 32mm Standard Eyestrap - Stainless Steel Breaking load (kg)726 kgBreaking load (lb)1600 lb Harken Part # 73

Lower eyestrap for CFJ hiking strap mounts. Reduces load on the mount, and prevents cuts on barefooted sailors.  Harken Part # 201.1

Spring to make the ratchet block stay standing up. Helps reduce mainsheet snags. Works on ILCA, SF, Optimist, 420, and many other small sailboats. 2" X 7/8"    Harken Part # 71.1 LP Part # 91217

The Harken Tiller Extension is a light weight aluminum tiller extension that attaches to most tillers. Available in several lengths to match boat type or preference. All extensions include universal joint and base for mounting on existing tillers. The...

This is the double centerline tube Quest dolly with Fat Wheels.  Dynamic Dolly, Type 4.2 This style is made for heavier sprit boats, e.g., Topper Omega, RS Vision, RS Venture, and Laser Bahia. Split bow tube allows for extension of bowsprit and...