I've had very good luck using a pencil grinder (or a Dremel tool) with a 1/8" rotary file. Always file the INSIDE of the cutting surface. If you file the outside diameter the bit is scrap.
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Mike Hilger
RV-6 N207AM w/G3X, 1,600 hours +
South St. Paul, MN (KSGS)
A&P, EAA Tech Counselor
We're all here because we're not all there...
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