I have a 21 ft American fiberglass that I want to add a topping lift to. The way my mainsail is, if you draw a line from the top of the mast to the back of the boom where the topping lift would be, the leach of the sail sticks out farther and would get caught in the topping lift line. The boom only sticks out less than a foot past the end of the sail. How can I add a topping lift?