On Dec 4, 2012, at 8:11 PM, Rick Gouge wrote: > I have a set of Bristol Drivers ... warn out on the tips. Grind SLOWLY. If you have a wire brush on a drill or drill press, that may well clear off the burrs. Or you can use a small sharp- cornered whet stone. Roy Roy Morgan k1lky at earthlink.net K1LKY Since 1958 - Keep 'em Glowing!