Join Date: Nov 2008
Location: Penobscot Bay, Maine
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Re: masthead sheaves
Sheaves that are made specifically for rope & wire halyards have a groove within a groove. The larger groove fits the rope, and inside that, a smaller one is for the halyard. The edge of the small groove abrades the rope. I had the same situation on my Alajuela. The sheaves were high-quality, made of aluminum and bronze. So I took them to a machine shop and had them turned on a lathe to eliminate the secondary groove. Cost 10 bucks each for 6. It took maybe 1/4" or so from the diameter, which still left adequate diameter for the line I was using. Using the rope/wire sheaves for all-rope was advised against by various published authorities--I think N. Calder and Brion Toss.
By the way, I've bought lots of running rigging from Milwaukee Rigging, who have a store on Ebay. They auction pre-cut lengths, usually New England Ropes brand, often with eye splices, for much less than WM sells the stuff for on sale. If you can wait and accumulate the lengths/sizes/colors you want over a little time, you save a lot of money. I have no connection with them other than having bought from them several times.
Last edited by VallelyJ; 01-23-2015 at 09:12 PM.