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In article , Dave99 wrote:
Ah ha... Relief angle. I did a search and they say the Drill Doctor
750 has adjustable relief angle. Thanks guys.

I was in Sears over the weekend with time to kill. They had several
models of Drill Doctor on sale at a significant discount. The 500 had
several features I didn't recall from the original model, and they were
sold out of the 750, so I couldn't see what sort of features it had that
would warrant the higher price. It looked like they had added several
adjustments to the 500, which could be good or bad. More stuff to fiddle
with & misalign, but in theory you can fix stuff you don't like.

Doug White