Over the past month I have seen two people at local regattas install a home made device on the aft part of the hiking strap on their SF. It appears to be a metal fitting through the aft loop which is attached to some sort of webbing with eyelets. A line is then past through the eye strap on the rear cockpit and back through the eyelets. This is done two or three times to create a purchase system which is easily adjusted. I was told it is legal? Does anyone out there use this kind of system? If so where do you find the parts to make it? I have gone to Home Depot and Lowes but just cannot find the right material.