Colin,
I did make a very much modified system for full keel lift and that is described somewhere in the forum. But my boat originally had the deck fitting that went over the slot with a single pulley built into it. The lifting rope was simply tied to the top of the keel then led through the pulley in the deck fitting and, via the diverter organiser by the mast, back to the coachroof winch. Direct pull. Fairly hard work but no problem.I think most Super Seals were originally supplied like this.
Chris. Elsa SS 26 No 103