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I recently removed the main halyard sheave from the top of the mast on
Revolution, #526. It is aluminum, 6.75" in diameter, .5" thick,
and has a 7/8" center hole in it. The hole has a brass or bronze
bushing in it which reduces the ID to 5/8".
This sheave has carried a wire rope for 25 years with little apparent
wear. I am now changing to an all-rope (3/8") halyard, which the
original sheave can handle without machining.
I also plan to have an extra aluminum sheave made up as a spare, and
machined specifically for 3/8" rope. My machine shop will duplicate
these at a cost of about $100.00 each. If anyone else is interested,
I would be willing to arrange a volume purchase. For reference, I have
attached photos of the sheave I removed from my mast.
-- Jay Davenport
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