Hi Randy, Good news.. I was just organizing my spring task lists and found the measurements in my notes.
My boat is a 1978 30 Mark 1. Masthead Sheaves are for both wire and rope: Material: Aluminum with bronze bushing 7/16" I.D. (bolt/shaft hole not the bushing hole) 9/16" Wide x 3.5" diameter 5/16" wide outer/rope groove (approx) ? Inner wire groove size unknown Hope that helps. Roy Mar 16, 2023 8:51:12 a.m. Leeward Rail <leeward_r...@hotmail.com>: > Randy,. > > Forgot to mention. The original C&C masthead sheaves are aluminum with > bronze bushings. Basically bulletproof and superior to modern plastic ones. > > They likely just need cleaning and lubrication. > > That said, some people have concerns that the dual groove design causing > premature wear on rope. Best solution to that IMO is to take them to a > machine shop and have them re cut for rope only. Cheaper than buying new > ones, and you end up with a better quality result. > > Cheers, > Roy > > Mar 15, 2023 2:46:00 p.m. Randy Stafford via CnC-List <cnc-list@cnc-list.com>: > >> Hello Listers, >> >> Does anyone happen to know the size (inner diameter, outer diameter, and >> thickness) of the original mast sheaves on a 30 MK I? I have hull #79, >> 1972. There are three at the masthead (two headsail, one mainsail), and >> three at the base. Does anyone know whether the masthead and mast base >> sheaves are the same size? >> >> The original sheaves were grooved for wire/rope halyards. I’m replacing my >> original halyards with all-rope Novabraid Argus, and will replace the >> sheaves to match. I’m preparing to order replacements from Garhauer and >> need to know the size. >> https://www.garhauermarine.com/shop/?_categories=mast-sheaves. >> >> Right now I don’t have access to the masthead, but I can remove one of the >> mast base sheaves to measure it. >> >> Thanks, >> Randy Stafford >> SV Grenadine >> C&C 30 MK I #79 >> Ken Caryl, CO
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