Technical & Reference Section > Tech and Restoration

how do i repair the thread on a 1 piece crank??

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Olliecw:
If the thread is well knackerd you can get a heli coil put in there.It basically replaces the thread.Don't know if it will stand the pressure ..It should. I had one done on a brake resevior on my racing kart and that held out under very high pressure..It could be a last resort if all else fails :daumenhoch:
Ollie

phantom 19:
A poper thread file is the answer.

PS you cant helicoil external threads only internal ones. A helicoil is generally stronger than the original thread also.

Philbert:
any semi decent machinist or bike shop should be able to sort that out with a 'die' kit in a jiffy! or if you wnted to do it yourself there readily available in places like halfords or any bike shop who deals with shimano (madison) should be able to get a nice park tool kit.

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