Warren, I did this kind of repair on a large Steinway upright about three years ago. I let off the string tension and worked TiteBond as deep into the crack as possible. Can't remember whether I used larger or longer plate screws. I think I just used the original screws. Of course it needs a lot of clamps to bring it back together. In any case, this repair has apparently held for about three years now. Walter Sikora, RPT Chapel Hill, NC On Thu, 6 Mar 1997, Warren Fisher wrote: > > I have a yamaha school studio in a public school that has the upper ends > of the back posts and its cross board pulled away from the pin block > about a quarter inch on the left tapering to a crack on the right. My > intent is to put glue in there, put about ten pipe clamps across the top > and then remove the top plate screws and drill all the way through to > the back to install large 6 large bolts to support this puppy. > > Do any of you have any thoughts, warnings, tips or reservations about > this process? > > I have a couple of questions: > > 1. If I just tighten this back up after gluing, how much pitch increase > will I get? The piano is just a little flat. Could it be too much? Do > I need to release string tension with all that can of worms? > > 2. Is there anything else I should check before I start gluing? > > Any help will be greatly appreciated? > > Warren > -- > Warren D. Fisher > fish@communique.net > Registered Piano Technician > Piano Technicians Guild > New Orleans Chapter 701 >
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