[mirwa]

For creating a hole in a guitar, be it for an endpin, machine head etc, a reamer is IMO best, be it a tapered reamer, stepped reamer or what have you.

Drills themselves are kind of inappropriate for fine wood work, the clearance angle and angle of twist make for a hole that typically displays tear out, tear out is bad enough in a guitar being built, its even worse in a guitar that has been finished

Steve