What size (letter or number) drill is used for 8-40 tap? Repairing a damaged scope mount on my Mauser. I found my dad's old box full of tiny taps and dies and it's full of lettered and number drill bits.
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A #33
#33 is for 6-40.
Good luck. If it's anywhere as good s mine, you'll love it.I'm getting cataract surgery on Wednesday. Y