After filling the old screw holes, I installed the new tuning machines to make sure they fit right. I also drilled pilot holes for the screws.

The tuning machines are Grover Rotomatic 18:1 tuners. They are the non locking type cause I have a locking nut for this guitar.

These pretty much fit the old Schaller ones from the 1980s. The only thing that didn’t line up was the screw holes. They are all 1/32″ or so off which is why I filled the old screw holes.