[EricH]

Originally Posted by Ian Curtis

Thread a nut on before you hacksaw the excess off, then unthread it off afterwards. It may turn off pretty hard, but it will clean the threads up significantly.

Or it'll help align the Dremel with a cutoff wheel, which doesn't mess up the threads as much... Oh, wait, that won't work in the pits, as it throws sparks. OK, so you do that at home and hacksaw at the event!