Harken suggests outfitting each system with Carbo lead blocks to ensure secure furling from the cockpit. For an inboard lead, utilize the 7401 40mm block on the bow pulpit. Both the 7401 and 7402 feature ball and socket bases that allow for precise alignment and smooth lead aft. The 40mm Stanchion-Mount Block, Part No. 7401, has a sheave diameter of 40mm (1 9/16 inches) and a maximum working load of 220kg (485lbs).