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Ages later I've finally finished this repair / project and the chuck seems to spin very true now.  But I have come to realize that the jaws are warped, something I understand is very common.  That is to say that the inside of the jaws close tighter than the outside.  I've read about true-ing jaws by opening them to clamp a round piece on the outside and using a boring bar to take a slight cut on the insides of the jaws.  Think this is worth doing?  Any other advice?


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