Paint the action side with a black magic marker. Use your dial calipers to measure the width, lock you calipers at half the width. Make a sweep from each side near the bore of the lug. Place the mark in the center of the hole.( this is wear an action wrench comes in handy.) use a rubber hammer if you have to in order to keep it centered. I have found if /i hone the face of the nut and the action, the lug stays put. good luck.
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