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This happened to me once, when I allowed some gorilla at the tire station to replace the tires on a prior rig. As I watched the Technician I saw that as he used the impact wrench he did NOT stop when the nut was on the stud and continued to let the rat-a-tat-tat go on for quite a few seconds. DOH! I should have stopped him, but I wasn't thinking. Usually the tech will stop at this moment and then complete the torquing with a wrench.
Some time later I needed to remove the nuts and you guessed it, I never had such a workout. I was able to work all the nuts off except for the last one. It broke off at the stud!!! The ONLY solution was locating and paying over $100 for a new brake drum (with studs). Nowadays I watch the techs and talk over the procedure FIRST prior to tire mounting. No problems so far and they are understanding of my concerns.
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