Masthead sheave--help me find--please! - Page 2 - SailNet Community
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post #11 of 28 Old 02-22-2017
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Re: Masthead sheave--help me find--please!

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Originally Posted by deniseO30 View Post
Or find a friend with a lathe or at least some creatvity
If you don't have access to a lathe, chuck it in a drill press set to the highest speed.

Grind an old screwdriver to a 1/4 inch radius and use it to scrape the groove.

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post #12 of 28 Old 02-22-2017
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Re: Masthead sheave--help me find--please!

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Ok everybody, help me find a 60mm x 12mm masthead sheave please. I have searched high & low for hours and cannot find this. I have an O'Day Daysailer and according from Rudy at D&R, a few of these boats were fitted with a racing mast which mine apparently has (added stiffeners running down each side of the mast) The masthead sheave is 2 3/8" x 1/2" or roughly 60mm x 12mm.

I sent Rudy a photo of this and he has never seen this set up before. The one that is in there is pretty chewed up and I really want to replace it. It has a 1/4" bore hole and handles the normal 1/4" halyards for the Daysailer. A nylon or Delrin would be nice--not any type of metal. The one that is in there looks like what we called in the military Bakolite (attached a photo).
Take a look at the RF-1765.
https://www.jamestowndistributors.co...t.do?pid=56841
Might need to open up the bore some. In any case 1/4 inch is small, maybe go with larger through bolt, better for bearing surface in any case.
Here is full specs:
http://www.ronstan.com/marine/product.asp?ProdNo=RF1765
fwiw I installed some of these that are 4 inch diameter Acetal from Ronstan and so far working great. The bore was slightly too small and I drill it out to fit my sheeve axel.
Note sheeve says max line 3/16, would think 1/4 would be ok, and actually looking at the specs, the rope gets smaller on the larger sheeve, seems there is a mistake, but would think 1/4 inch is ok...

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Last edited by casey1999; 02-22-2017 at 08:17 PM.
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post #13 of 28 Old 02-22-2017
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Re: Masthead sheave--help me find--please!

merimarine.com. Don will make whatever you want . . .
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post #14 of 28 Old 02-23-2017
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Re: Masthead sheave--help me find--please!

Contact Garhaurer Marine. Odds are they've got what you need and inexpensively to boot.
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post #15 of 28 Old 02-23-2017
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Re: Masthead sheave--help me find--please!

guessing the OP got lost ...


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post #16 of 28 Old 02-23-2017
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Re: Masthead sheave--help me find--please!

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Make one! Hole saw a plastic cutting board, put a bolt through the middle hole, put the bolt in a drill turn it on, and scrape or sand the edge like a pulley.
As a cheapskate myself, this would be my favorite solution. To extend the discussion beyond the OP's situation just a little, how do you all think a sheave made of plastic would perform on a larger boat? I'm guessing that if it was the correct size, it would be OK.

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post #17 of 28 Old 02-23-2017
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Re: Masthead sheave--help me find--please!

Plastic cutting board plastic has so many properties that work for such things it's hard to not include it the DIY arsenal

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post #18 of 28 Old 02-23-2017
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Re: Masthead sheave--help me find--please!

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As a cheapskate myself, this would be my favorite solution. To extend the discussion beyond the OP's situation just a little, how do you all think a sheave made of plastic would perform on a larger boat? I'm guessing that if it was the correct size, it would be OK.
The plastic cutting boards I have seen are too soft to be used for any length of time. High loads and heat from the sun would do them in quickly.

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Re: Masthead sheave--help me find--please!

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The plastic cutting boards I have seen are too soft to be used for any length of time. High loads and heat from the sun would do them in quickly.
Kinda just the the original plastic or the lost OP would not be desperate

I'm old enough to know when plastic was a new invention, NO plastic holds up to the sun very long.. but mfg's persist...

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post #20 of 28 Old 02-23-2017
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Re: Masthead sheave--help me find--please!

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Originally Posted by Barquito View Post
As a cheapskate myself, this would be my favorite solution. To extend the discussion beyond the OP's situation just a little, how do you all think a sheave made of plastic would perform on a larger boat? I'm guessing that if it was the correct size, it would be OK.
My S&S34 had the original acetal plastic sheaves since she was built in 1978. She has circumnavigated and has sailed probably 60k miles during the last 40 years. I just replaced the original sheaves with ronstan acetal. The old sheaves were still working, but had a few hairline cracks. I am sure there are some better custom made sheaves, but I wanted off the shelf to make things easier.
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Last edited by casey1999; 02-23-2017 at 03:39 PM.
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