Re: furling and hallyard wrap.
My furler eliminates that problem by eliminating the halyrd swive,l for a block on the side of the extrusion. You hoist the sail, tie the end of the halyard to the drum, take the rope tail off, and tighten the luff with a downhaul on the drum . The halyad block and all rotate with the furlr. A friend, working for a rigger, said a lot of people were doing that with commercially made furlers .
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"