As kind of an aside, the version of the CDI Reefer II that does not have an internal halyard uses a unique lock at the top to secure the top of the jib. This is accomplished by securing the top of the jib to a travelling part and inserting it in one of the slots on the double grooved foil. The sail is raised by inserting a second piece (a "key") into the parallel slot and raising it with the halyard. When the two pieces reach the top the lock engages and the hoisting traveler is then pulled back down with a messenger line leaving the sail up and locked. The sail is tensioned with a down haul at the foot and secured. When lowering the sail, the "key" is reversed and sent back up the vacant slot where it unlocks the head of the sail and both come down together.
My problem has always been the way my sail is attached to that piece that locks. I have a piece of wire that is looped through the head of the sail and secured with a swage sleeve. The same is done on the locking traveler. I can never hoist the "key" past the cable loops no matter how hard I pull on the halyard. Even after hammering the wire loop as small as I possibly can, the tolerance is still too close. I always have to go up the mast and hammer that thing up into the lock.
How do the rest of you secure the sail head to the gizmo so the key can pass by it?