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Thread: How to replace "wheels" on single blocks?? Reply to Thread
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  Topic Review (Newest First)
07-20-2008 11:31 AM
capngregg Souljour

The sheaves are replaceable but the block was not designed or intended to allow the sheave to be replaced. I have replaced sheaves on identical blocks in the past (for friends on a budget) but it took a while to find just the right sheave. On top of that I had to manufacture the replacement rivets. If you have all the right tools it's no big deal but for the # of manhours you would consume it would be better (and depending on your motor skills and replacement materials) safer to purchase a replacement block.

West Marine has a good assortment of replacement sheaves in their catalog with all the dimensions and composition materials noted.

Good Luck!
07-19-2008 09:07 PM
souljour2000 Thanks for the good advice...I may "give it a go" with a carbide drill bit and see if I can get into those rivets without a struggle...afterall..they are worthless as they are so its not like I am out anything except some time and expensive drill bits...and then the cost of the sheaves and the new pins in their place...the blocks are in great condition .(other than the 25 cent pieces of plastic each of them has...also known as drilling out the rivets doesn't work l will have to check a local surplus sailboat supply depot called "Nautical trader"..been looking for a reason to go back there anyways...well see.....Thanks so much guys...
07-19-2008 06:09 PM
Originally Posted by souljour2000 View Post
Am on my third boat and still dont know what to do when I have an old and melted -looking wheel on a this case a single block..can I replace the plastic pulley?

Soul-j, Yes, you actually can replace the sheave in almost anything. But, usually it's not really practical.
The blocks in the photos are riveted and while the rivets can be drilled out and replaced with a bolt, it probably wouldn't be worth it.
When you are talking about a larger more expensive block, then it would probably make more sense to replace the sheave.
Having said that, it really depends on how handy you are and how much your time is worth.
07-19-2008 12:30 AM
sailaway21 Souljour,
Nice lookin' boat there. You can replace those blocks for $40 or so. West Marine has some Ronstans (Series 30) that take up to 5/16" line that'd probably do the trick. If your line is a bit heavier you might get all the way up to $60 to replace-and that's at WM-there's better deals out there.

Good luck to you. And you posted just fine, you were asking a question that you probably thought had a single correct answer. I'm sure that SailingDog did not mean it when he implied idiocy and I'm surprised he has not aplogized yet. One of these days I may even read that new to sailnet forums post, or swallow a bullet, it's a toss-up.
07-19-2008 12:10 AM
sailingdog One other point... buying new Lewmar Synchros means the blocks are far less likely to fail than are re-built home-made cobbled blocks that you'd have after drilling out the rivets.
07-19-2008 12:05 AM
sailingdog Hey signed a non-disclosure agreement about that part...I'm going to have to sic a lawyer on yah... Wait...damn... you are my lawyer.... Can you sue yourself for me...
07-18-2008 11:29 PM
Originally Posted by sailingdog View Post
read the post in my signature...
there's a fair bit of advice there on how to maximize your time on sailnet...
And it helps Dog get a little $$ in his pocket!! Dog how much did you make this month? Once he can get the hit count up, the advertisers will come in and then he will have it made!!
07-18-2008 11:25 PM
sailingdog read the post in my signature...
there's a fair bit of advice there on how to maximize your time on sailnet...
07-18-2008 11:22 PM
souljour2000 I agree...thanks for all the help Sailingdog!
07-18-2008 11:17 PM
sailingdog Given the prices for the smaller Lewmar Syncro blocks, I think you'd be better off buying them, rather than trying to cobble something together. THink about the cost of the replacement sheaves, pins and such, and you're pretty much at what the Lewmar Synchro blocks are going to cost.
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