The Pulley Whip connects the sail to the Kart and absorbs the impact when the sail whips from one side to the other during a high speed gibe. They are designed to fracture rather than blow-out the sail. In the event of a broken Pulley Whip, the fibreglass shaft can be cut flush, re-drilled for the spring button (8mm hole) and reused. This can be done 2-3 times before replacing, however a split shaft (with a crack running up the length of the shaft) will need to be replaced. Note: For ultimate performance, our racers cut-down the shaft to 350mm to allow the sail to be sheeted-in more. Complete with pulley, spring button and foam pad.