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  #1  
Old 09-12-2012
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C&C Halyard Sheaves

I may need to replace the halyard sheaves and or the brass bushings on my 1979 C&C 34 . However I need to know how they are attached and what zize are they. If possible I wouold like to have all the parts available so theat when the mast comes down I can do the replacement and then step the mast before winter. I replaced the wire to rope halyards 20 years ago but the main halyard sheave has stopped turning.
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Old 09-13-2012
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Re: C&C Halyard Sheaves

I can't help you with the size of the fittings on your mast (C&C 34).
I can say that I've seen wire rope wear sheaves down pretty badly in our out haul which is internal to our boom. For this project I replaced the sheave (on the boom) with a rope designed Delrin sheave from McMaster Carr: McMaster-Carr
and I replaced the wire rope with a fairly high tech, low stretch line.
Might be time to convert to an all line halyard and replace the sheave.
Check out the picture.
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C&C Halyard Sheaves-old-new-sheave.jpg  
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Old 09-13-2012
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Re: C&C Halyard Sheaves

Try South Shore Yachts in Ontario or check out cncphotalbum.com
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Old 09-14-2012
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Re: C&C Halyard Sheaves

I would doubt anyone would be able to give you the exact dimensions for the sheaves.
I can tell you that they are more than likely dual grooved sheaves. One large groove for the rope and a smaller groove for the wire. They will be held in place by a retaining plate that covers the hole on the side of the mast that the shaft sits in. Remove the plate, slide out the shaft and the sheaves will hopefully fall out.
I just replaced my wire to rope halyards this summer. Three wire to rope halyards were over a $1000. My sheaves were OK, they just needed some lube. The sails drop to the deck under there own weight now.
There are some pretty cool rope products out there and I too would suggest all rope halyards and rope sheaves.
Rope is less expensive to replace and no meat hooks.
If you take your old sheaves into a machine shop they will be able to make you some new rope only sheaves for fairly cheap and it should only take an hour or so on a lathe.
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Old 09-14-2012
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I am a hobby machinist. Supply the dimensions,the shipping and the material (or pay for it) and I will make them for you.

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Old 09-18-2012
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Re: C&C Halyard Sheaves

I pulled the sheaves from our C&C a couple of years ago. The bushings were badly worn but easy to replace. A good hardware store has standard bronze bushing that you can press in with a vice or C clamp as you push the old ones out. Use a short section of pipe or a socket to provide room for the old one to come out.

Since I was changing to rope halyards, I put the sheave on a lathe and used a 1/2 inch rotary file in a drill motor and reshaped the grove from the V to a U. A decent machine shop can do it easy enough but it looks like the best offer comes from Tyrannus.

I wanted to keep the aluminum sheaves because I didn't trust the delrin sheave to keep their shape under prolonged tension and
RigRite was way too expensive. If they're badly damaged, I'd talk to a machine shop and have some new ones made or try the delrin sheaves.

Rope halyards are the only way to go. I got tired of bleeding all over my sails from meathooks on the wire.
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