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Author Message   Glenn Tinkerer Username: Glenn Post Number: 1037 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Saturday, July 21, 2012 - 03:43 am:    Wear can play havoc to helical threads. Make sure you have not bent any of the wafer thin starts and then really clean out everything before trying every start position. As you progress around the start positions, check that you have not damaged any of the thin first portions - if you find this happening gently remove the very end of that thread with a very fine file.