re-drilling headstock tuner holes is best done as a 2-step process - something you can easily do if you have reasonable drillpress skills ...
1) find/make wooden dowels that match the diameter of your current holes, cut them to length, and glue them into the holes. since you're going for larger holes, the exact wood isn't so critical but it should be able to hold a precise center divot location for the next step. if they are a little shy of the headstock face you're OK, but if they're proud you'll need to plane then down flush so you get a cleaner hole
2) once the glue has dried, measure and mark yourself new hole centers keeping in mind that the new diameter will need to be compensated for if you don't want your strings to have a slight sideways angle after the nut. use a backing board to clamp the headstock onto so you can also drill a clean hole thru the back side, and clamp the assembly into place with the centerpoint of the bit perfectly on the new hole center point. use a Forstner bit (in the case 11/16") to drill the hole thru the headstock and a good 1/16"+ into the backer board, then align again for the next hole making sure you have clean, undrilled wood under the new hole location.
when drilling, don't use too high a speed so that you'll avoid overheating the Forstner bit
anything else I can answer or clarify for you?
all the best,
R
p.s. Andrew - should this thread be moved to BP&B for future reference purposes?
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