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That's probably what has happened. The two halves are wore so they are clamping but just not enough. You think that just making a shim from a can tin, cutting it the same shape as the halves should do the trick?
countryboj-
You think that just making a shim from a can tin, cutting it the same shape as the halves should do the trick?
The shim needs to sit on the bevelled faces, might be tricky to get it to stay there while you're assembling everything but it has to be worth a try before setting off down any more expensive roads.
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Is there enough material in the two bits for you to file it to fit?
Not an expert on this and tester is probably your best man since he's been machining loads of custom stuff.
gbj_tester
coventry_eagle
Not clamping how?
If the two halves are meeting in the middle before they apply any force to the seat post, it's probably because the bore holding the clamping parts has pushed away from the seat tube. It might only take a small shim to re-establish contact.