| If I had to do this, I'd make a template to rout the rounded end of the heel flat, to fit the neck pocket. With a pattern cutting bit, this might be no more than a flat piece of whatever, clamped to the bottom of the neck.
And, if I were fussing this much, I'd go ahead and convert it to threaded inserts and machine screws; all of my basses have been done like this.
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Instrument repair/setup, Bay area
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