before you go apeshit with the dermel, listen to Collegestudent. The valve grinding compountd trick is tried and true, I learned that when i worked at the shop.
My boss told me that it would cause the screwdrivers to grip so hard that the tip would break off in the screw before it slipped out.....
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so much to do, so little time.....at least i aint bored.
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