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  #1  
Old 02-26-2011
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Question Source for replacement masthead sheaves?

Greetings Sailors!

I have a '73 Balboa 20, and it has two sheaves in the masthead which are probably original and no longer serviceable. They appear to be made of some fiber material, and basically they've split in half.

Who knows of a good source? West Marine doesn't stock anything close. These are so worn that I'm not sure of the original measurements, but I'm pretty sure they take a 5/16" line (for main sail). The outside diameter is 1 3/8", and the shaft for the pin is 1/4" I've found smaller diameter sheaves but smaller won't work - the line rubs on the mast because it's too close.

I really don't want to replace the entire masthead assembly because of two sheaves which probably cost about $20 each or less.

Thanks!
Max
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Old 02-26-2011
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Start with RigRite, Rigging Only, or Dwyer Mast. Not sure about the 20 bucks though.
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Old 02-26-2011
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Don't know exactly what you're looking for, but you should always check the Sailnet store to see if they have it. If so, you can rarely beat the price. And they support this cool forum we all hang out on.

Here's an example (under $20):

Wichard FIXED EUE 45MM SHEAVE BB

PS - great job on the new store layout SN!
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Quote:
Originally Posted by maxbumpo View Post
Greetings Sailors!

I have a '73 Balboa 20, and it has two sheaves in the masthead which are probably original and no longer serviceable. They appear to be made of some fiber material, and basically they've split in half.

Who knows of a good source? West Marine doesn't stock anything close. These are so worn that I'm not sure of the original measurements, but I'm pretty sure they take a 5/16" line (for main sail). The outside diameter is 1 3/8", and the shaft for the pin is 1/4" I've found smaller diameter sheaves but smaller won't work - the line rubs on the mast because it's too close.

I really don't want to replace the entire masthead assembly because of two sheaves which probably cost about $20 each or less.

Thanks!
Max
These guy's aren't cheap, but you'll get what you want.

Zephyrwerks - The Sheave Factory

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Old 02-26-2011
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I looked into Zepyrwerks when I needed a sheave for our in boom out haul but they were not cheap by any means. I ended up buying 3 Delrin sheaves that were quite close to my dimensions from McMaster-Carr (around $20) and was able to use 1 with only minor reshaping.
McMaster-Carr
While Delrin might not be the ideal material it is strong enough to last quite some time and cheap enough to replace if/when it needs fixing again.
While you are at it you might consider going with all rope halyards and get sheaves that will be suitable for that purpose.
Good luck.
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Old 02-26-2011
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Thanks guys, lots of info to sort through now. Looks like I'll need to take some careful measurements of the mast head to determine which sizes will work, and go from there. Fortunately measurements are easy - boat is on trailer and mast laid down.
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Here is a photo...

of the old and new sheave I got from McMaster-Carr.
The old aluminum sheave had degraded so much that the line jumped the sheave and would jamb. You can also see that I sanded one or both sides of the Delrin sheave to make it fit.
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Source for replacement masthead sheaves?-new-old-sheave.jpg  
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Old 02-27-2011
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Maritime Plastics in Annapolis might be able to help you. Ship them your old sheaves and they'll machine you a new set out of Delrin or something. I'm not sure about their rates. I have no affiliation, just heard about them.

Maritime Plastics
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Old 03-02-2011
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Dwyer Aluminum Mast website has what I need for $10 each . Plus $11 shipping

I've ordered two delrin sheaves that are 1.5 inches diameter and 7/16 inches thick, with a 1/4 center axle hole. They should fit with no modification required.
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