I do not know if this has been discussed before, but the way i have been doing it for a while is this. I would mark the spot for the posts before painting, and then after the body has dried, take an exacto blade or a razor knife and on that mark you put on the body, start applying some pressure to it with the blade, just enuff to get the tip slightly in the body. Slowly start twisting the exacto knife and it will act as a small drill. Then you can take a drill and a drill bit and make your body post holes easier. Thanks, and hope this works. I hope i explained it enuff.