The Optimist Halyard line with Optipart hook-in plain bearing Optimist halyard as used on the Silver spars from Optiparts. The hook-in block has a round fiberglass filled nylon case designed to fit...
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...