Most soft top surfboards use a webbing loop on the back of the board instead of a leash cup. This webbing is made of nylon and is secured on by two plugs (the same ones that hold the rear fins in place) that go through the board.
To install your Santa Barbara Surfing Soft Top leash, simply insert the "leash string" that is attached to our leash through the webbing strap. Then simply put the other end of the leash through the leash string loop, and pull it all the way through.
Your leash should now be attached to your soft top, and you are ready to go run over people over in the lineup!