----- Original Message ----- From: "Ron Nossaman" <RNossaman@cox.net> To: "Pianotech" <pianotech@ptg.org> Sent: July 02, 2003 5:39 PM Subject: Re: Accu-just hitch pin removal > > >Ron, > >Good ideas. Actually the piano is coming in more a complete restoration > >next summer in which I'll have full access from underneath the piano and > >punching the material back up should be more probable. > > Hi Tom, > Then that's probably your best bet. If the pin involved spans two unisons, > it should be reasonably ignorable until then. > > >I'm still amazed at the rigidity of this material. I thought this would > >be a quick drill out and install time. Lesson curve continues! > >Tom Servinsky > > Those little hummers are hardened steel, similar to a high speed steel > drill bit. You aren't going to cut them out with any edged drill bit on the > planet that I'm familiar with. It would take aluminum oxide or diamond > abrasives, and flooding the area with coolant would be a tad > counterproductive. It does surprise me that it won't drive on through > though. It seems pretty unlikely to me that the holes in the plate wouldn't > be drilled through, but it's possible. I had an SF in the shop about seven > years ago, but I don't remember if that's the case or not. There's a lot of > spring to these pins, and it takes a pretty good lick at best to get them > to move in the hole, so even with a clear through hole it's hard to move them. > Yes, they should be through-drilled except in the bass. Corrosion of some kind does build up over time and the break-away friction can be considerable. Del
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