I do not think use of powdered rosin on backchecks is a good idea, or roughing up the tails on grand hammers. Checking of hammers on a grand piano is best done so that the arc of travel of the hammer collides with the arc of travel of the backcheck. Proper regulation will save a lot of wear and tear on those backchecks. Carol Beigel, RPT Greenbelt, Maryland
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