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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 05-05-2011
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Why wouldn't it be acceptable to use a Dremmel to grind the head off the axle shaft, remove the sheeve and axle, replace with new sheeve and ss bolt, sleeve, and lock nut ??

Jurgy
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  #12  
Old 05-05-2011
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Why not thread an eyebolt into the sleeve and then shackle the new block onto the eye?

Frankly I'm surprised that it's so hard to find blocks with that attachment method... it seems pretty reasonable. It's basically how the casters on my desk chair are attached :P

edit: Rigrite has the exact blocks you need: Isomat Mast Base Turning Blocks
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Old 05-05-2011
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Quote:
Originally Posted by AdamLein View Post
edit: Rigrite has the exact blocks you need: Isomat Mast Base Turning Blocks
IF I could get the sleeve out these blocks would work. To get the sleeve out I have to raise the collar.

So far I haven't found a block or any other device that works. I have an email into the tech folks at Rig Rite and hopefully they can help me out.
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Quote:
Originally Posted by Jurgy View Post
Why wouldn't it be acceptable to use a Dremmel to grind the head off the axle shaft, remove the sheeve and axle, replace with new sheeve and ss bolt, sleeve, and lock nut ??

Jurgy
That may be what I end up doing.
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Old 05-05-2011
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I'm assuming you can't turn the threaded stud out? (Looks like you tried a pipe wrench??) The design appears to be intended to allow the assembly to be taken apart where it is. Maybe someone used loctite on the lower threads?

If it was just a trapped sleeve as you suggest I wonder why they would use a hex nut instead of of a square head in the slot..... (kinda thinking out loud here)
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Ah okay, I guess I didn't realize the trapped sleeve was the problem. Do you know how the sleeve is connected to the nut? Is there a threaded stud joining the two?

Anyway if you can get a new block, why couldn't it be threaded onto the existing sleeve?
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I think that if it were mine, I would probably try to save the original blocks by drilling out the rivet that holds the sheave and replace the sheave by using a nut and bolt. The hex head of the bolt and the nut can be thinned down by grinding and polishing and the difference will be hardly noticeable.

Then when the mast is next pulled and the collar can be removed you can replace the blocks if you wish.
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Ah okay, I guess I didn't realize the trapped sleeve was the problem. Do you know how the sleeve is connected to the nut? Is there a threaded stud joining the two?
It appears the sleeve and nut are one piece.

Quote:
Anyway if you can get a new block, why couldn't it be threaded onto the existing sleeve?
I haven't been able to find a block with a M8 metric stud.
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What about re-tapping the stud that is in there? Please understand that the fact that I'm suggesting this should in no way be taken as an indication that I know what I'm talking about ....
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I have a similar problem of broken sheaves, on triple blocks at the base of the mast. It's an old boat, I'm just going to grind off the heads of the axle rivets and replace the axles with shoulder bolts and nylok nuts, which are available in in inch and metric sizes. The sheaves are easy, lots of people sell them. In my case I can just stick a piece of plastic in the lathe and cut a whole new set in about 1/2 an hour.

Gary H. Lucas
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