If it only occurs when playing down-scale, perhaps it is the right front rail bushing. A small shard of glue might have squeezed up over the felt and it rubbing on the pin. If it were the damper, it would make the noise when lifting the underlever by hand. Regards, Jon Page, piano technician Harwich Port, Cape Cod, Mass. mailto:jonpage@comcast.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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