mike regish wrote:

I have a 1/4-20 bottom
tap I'm going to run in to clean up the threads.

One more thing you've probably already thought of. Most taps have a tapered tip. When
used as a chaser, such a tap will not clean the bottom threads in a hole. You can
take care of this by cutting and/or grinding most of the tapered section off the end
of the tap.

George Patterson
None of us is as dumb as all of us.