Again... only an idiot would expect anyone to be able to give any advice based on the little information you've provided.
You haven't mentioned the brand or model of block. Without knowing what brand and model of block, or at least a decent photo of the blocks in question, there is no way to know if the sheaves are user replaceable.
The "mounted single block" could be a cheek block, which looks like this one from Lewmar:
Is the "tethered single block" a block on a shackle? A block on a shackle looks like this:
The sheaves on the bottom block in these two photos are replaceable IIRC, the sheaves in the block in the top photo are not.
Okay thanks.... I dont know if the photos will come thru but here are the two culprits....is a mounted single block and what i will probably erroneously call a tethered single block...these both have major warp issues with the sheaves..do u think they can be manually replaced by someone like me or do I need to buy new blocks altogether??? Thanks.. Morgan
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—Cpt. Mal Reynolds, Serenity (edited)
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