In article <45F93543.7F75A46A@allsttream.nett>, "mikef2316
()"@allsttream.nett says...
>
> My theory on lug nut and wheel stud failure: It's cause by mechanics
> using impact guns to remove the nuts. After the nut is disengaged, the
> gun spins it very quickly with the ends of the threads touching each
> other.

I used to work with a guy who, in the interest of speed, would pull
spark plugs with a 3/8" impact gun. Then he started complaining about
all the plug hole threads being messed up...