Doh! Sorry, but Dan Erlewine is the man. He's stew mac's guru. He has all the cool tools. I was close to ordering a pin reamer for the next job, but it was $164 for a hand tool that I'd use once per guitar. I used a step bit in my countersink driver and a rat tail file that I already had instead. Good boy, Jim.
Here's why :
The tuner pegs are slightly tapered. The top facing part of the shaft is 3/8"
But they widen to 25/64" at the bottom.
My step bits have a 3/8
But then go 13/32 then 7/16 or 14/32.... 25/64 is 12.5/32nds. So I needed to go about half way there with the former. I didn't do any math to figure that out, I just reamed the first hole a bit, tried the tuner, repeat until it sank to the right depth.
Then I made the pencil mark on the bit and brought the rest slowly down.
And cleaned up the edge with this file.
