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both shaft and hole likely to be 6mm nominal
.09mm quite a small difference
possible bolt may have been compatible diameter prior to plating
would definitely take some emery cloth to shaft before enlarging hole in caliper arms
removal of some plating should be eno'
it is available in strip form on rolls; used by plumbers to dress copper pipe ends prior to soldering
prior to rendering any alteration check to verify that thread is the correct 6.0mm X 1.0
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Last edited by juvela; 03-29-23 at 10:35 AM.
Reason: addition