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Has one inherent problem for use on a Sun Cat: you pull the halyard up normally until the very end of the process, then grab it and loop the bight around a cheek block on the mast. Only after you've looped the cheek block do you have the triple purchase. This will mean going forward during sail raising, then returning to the cockpit to finish the job. It will also mean going forward to release the bight from the cheek block before lowering the sail.
I'd go with a double halyard setup instead. To do that, lower your sail all the way below the hinge point, as far down as it goes. Cut the halyard just past the upper cheek block (cutting the part that heads down, not up, in other words). Splice or tie a block onto the end you just created.
Next, put an eye strap down low on the mast and run a new halyard from the eye strap to the new block you just tied/spliced on and back down to return to the cockpit through the existing hardware. This will give you a 2:1 piece which is permanently attached and doesn't have to be rigged and unrigged during sail raising/lowering. Problem here is that double halyard wench doesn't have the same ring to it. 
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Catboat Forum
Gulf Island Sails
Gene, & Any Interested Winching Parties: 
-- Vicki's Winch Dilemma -- 6/4/08 4:58p.m.
Sorry, winch wench 
