3/8" on the middle finger and 1/2" on the ring when drilling for finger inserts... It may be a little excessive, but I have never had any trouble.
S^2
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I'm a great quitter. It's one of the few things I do well. I come from a long line of quitters. My father was a quitter, my grandfather was a quitter... I was raised to give up.
- George, in "The Old Man"