About this not putting the thumb in all the way; many, many years ago I ran into Andy Veripappa doing a clinic. He told me to experiment with this. I went so far as to try a "thumbtip" drill. That was no good, but there are times, like Tony, that I don't put the thumb in all the way.
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"I do desire that we may be better strangers." Willie the Shake, As You Like it(III,ii)