Acoustic Guitar Construction

kencierp wrote:The holes in the bridge are normally 3/16" (KMG machining is programmed as such) If you don't want to purchase a reamer, there are a couple of options that work fine. Of course drill a 3/16" hole in a scrap piece of hard wood to test your process. The first is to use a 1/4" rat tail file, I have one that I broke off and chuck into my drill, I marked the desired depth with a piece of tape -- very quick and easy. A less aggressive method is to use the bare handle end of a bastard file, the angle is correct for most pins and the hardened metal has very sharp corners that shaves the holes easily. The latter is a trick I learned from Irvine Sloane.