The Optimist Halyard Block with an official Harken plain bearing block and hook as seen under Optiparts Sailing Spars online. Harken Ball bearing hook-in block as used on Blackgold racing masts. Due...
Plain bearing halyard block as used on Optimist School mast. Specifications Cheek material: Stainless steel Sheave material: Nylon Sheave diameter: 22 mm