Bill, Here at the U.W., thumbtacks in the hammers absolutely would not be allowed on any of our concert instruments. The change in tonal character after just one insertion into the striking point would be considerable and, in the case of pianos in the larger hall, would render them unfit for concert use. It would take several hours to return them to concert-ready condition. We have a small "beater" grand available for people who insist on doing preparations. At both our halls, the piano technician has the authority to make decisions on matters of pitch standard as well as exotic preparations. In both cases, if we decide to allow a pitch change or a preparation which will require extra work for the technician following the concert, an appropriate extra charge is assessed in advance. Good luck to you, Bill. Steve Brady, RPT "The most expert and rapid tuners are... University of Washington possessed of a highly excitable, sbrady@u.washington.edu nervous, and emotional temperament, verging on the border of insanity at times." -Daniel Spillane, The Tuner's Guide
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