Mark G, that is basically what I was getting at, but hadn't gotten as far as to incorporate the deadeyes.
I have read that Amsteel shrouds move too much and need to be adjusted frequently, at least on boats that get rigged and de-rigged, probably having to do with constructional stretch, so I was thinking about ways to do that easily.
Now that I have made it, and thought about it, I am convinced that this is a really good way to do the adjustment on the trapeze lines, since they need a large adjustment, and it needs to be able to be done on the fly easily. They don't need much advantage, since you can lift your body weight a bit while adjusting.One common way to do it is to use about $100 worth of pulleys per trapeze, 4 per boat. I can get this done for nothing if I make my own low friction rings.
It definitely does not have enough advantage for shrouds on a large monohull, but I am doing this on a Prindle 19 catamaran, which weighs 380Lbs, has a 31' mast, and the technique for adjusting the shrouds as they are now is to use the boom and main sheet to pull down the boom on one side and then the other to relieve pressure on the shrouds to move a pin in a hole in the shroud adjuster, so really I won't need any advantage at all.
I may still just use a soft halyard with multiple knots, as described in another thread.
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