Rather that a spiral reamer - use a straight fluted reamer as that definitely won't pull into the existing hole. Be very careful to hold the reamer at the same angle as the original hole or - well - we don't want to see what would happen :-( John Fortiner Billings, MT. -----Original Message----- From: Ron Nossaman [mailto:rnossaman@cox.net] Sent: Thursday, April 28, 2005 10:28 AM To: Pianotech Subject: Re: Enlarging existing bridge pin holes > I am repining a bridge and because the bichords are a strange in between > size (about 9 1/2), I need to enlarge the holes to accommodate a #10 > pin. I have not had much luck doing this in the past in a clean way and > am wondering how others approach this. My thought is to reinforce the > bridge cap with a clear coat of epoxy first before drilling it out, > reaming out any excess that might create large globs inside the hole > before it sets up. Any thoughts on this? And what is the best way to > approach redrilling an existing hole: high speed, low speed, by hand? > > David Love I haven't done this a lot, but I've had the best luck hand drilling with a modified drill bit. With a diamond whetstone, I ground the cutting edges parallel to the length of the drill. This makes a scraping cutter that doesn't grab and pull itself into the hole like a standard drill bit. Or you could order a spiral reamer of the appropriate size. http://www.trianglereamer.com/highspeedsteel_reamers2.html
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