In a message dated 98-12-21 22:19:58 EST, you write: > The > action was extremely sluggish, but aside from needed hammer filing, > regulating, and tuning, it appeared to be in good shape. I questioned > the band director about the yellow residue. It turns out that years > before, vandals had broken into the school, and among other things, had > discharged a dry chemical fire extinguisher inside the piano! About a year ago I cleaned out a Baldwin SF10 at a high school where vandals had discharged an entire dry chemical extinguisher inside the piano. Even though the entire piano was saturated with this powder, none of the centers were sluggish or affected in any way, which leads me to believe that the powder is not the cause of your tight centers. I would find one of the worst centers and try a little Protek and see if that frees them up. If not, I would try a shrinking solution like alcohol and water and then dry them carefully with a heat gun, working the centers gently. Dave Bunch
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