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Carefully run your derailleur hanger tap thru the threads. I bet there is a little buildup in the root of he threads. Be sure to use cutting oil with the tap.
There is a posibality that threads in the hanger have been "pulled" a little by tightening the derailleur bolt a bit too much so now the pitch diameter of the threads are not quite to spec.
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SPOKE
Life's too short to ride cheap bikes!
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