On a Warmoth neck that is drilled for Schaller they usually drill a 3/8 inch hole with a smaller hole on the peghead, unfortunately a planetwave tuner wouldn't fit because planet wave requires a 3/8 inch hole all the way through, so take the 3/8 inch bit, run it in reverse and just push it through (from the headstock of course, you don't want to crack anything) so you can avoid grabbing the existing wood and chipping things... or a dremel sanding drum or a reamer works, but I had to do this to my koa neck because I asked for schaller hole (why do I always do that?) and thought a planet wave would just fit...
Of course after doing this the hole was still too tight so I used a stick with sandpaper taped around it and a drill to enlarge it, you don't have to do a perfect job because the tuner and its hardware covers a multitude of sin...
Of course after doing this the hole was still too tight so I used a stick with sandpaper taped around it and a drill to enlarge it, you don't have to do a perfect job because the tuner and its hardware covers a multitude of sin...