Needed a non angled cut off to cut the flue out of the water heater during the foundry furnace build.  Rather than buy one I turned down a bolt and made an arbor that fit the Makita die grinder.  It can only be used at a reduced speed as the die grinder runs too fast.  Forgot and plugged the die grinder directly into the outlet and bent the mandrel.   If I ever need one again they are easy enough to make maybe use a grade 8 bolt next time.