We recently purchased a Harken self-furling jib from a nice guy in Canada. It came with the base drum and the top piece. We do not have any idea how to attach the top to the mast. Our current jib rides on the forestay that connects to the mast with a hook that "twists" into a slot in the mast. This self furler does not connect the same way. Does anyone have any ideas what we need to attach the self furler?