I thought bushings were inserted after the pinblock was drilled, and that the hole was smaller than the pin diameter deliberately to give the pin a little less tendency to flagpole. I would think drilling the bushings after insertion would almost defeat their intended purpose. --David Nereson, RPT -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]On Behalf Of Frank Emerson Sent: Saturday, March 31, 2007 6:00 AM To: Pianotech List Subject: Tining pin bushing purpose, was Xylol for tuning pin bushings > Mason & Hamlin said that one purpose of the bushings was to center the > drill bit in the plate's hole, so that would be one downside. > > --Cy-- Other piano manufacturers besides M & H will tell you that the primary, if not the sole, purpose of tuning pin bushings is to center the drill in the hole. But, is that really optimal? . . . . . <<
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