Lightweight Optiparts Optimist trolleys and trolley parts for the Optimist. The Optiparts Optimist trolley has been designed to be the most functional available. Spring locking (quick release) of all parts allows the unit to be disassembled in a matter of seconds for storage and travel. The frame has welded joints and is anodized to prevent corrosion. Optiparts supplies all spare parts like wheels and clips.