Those are particles from the hammer butt where the jack rubs against the buckskin as it escapes each time the key is played. Static holds it in place. The center of the keyboard has more than the outer reaches. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100417/a19f1226/attachment.htm>
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