----- Original Message ----- From: "James Ellis" <claviers@nxs.net> >The problem is too much of a hump at the very front of the butt leather, making the jack have to move too far out before it will clear. I ran into the same problem 30 years ago with two Yamaha P2F's at an institution I service. I tweaked the regulation on the offending notes with no immediate satisfaction, but now 30 years later they are behaving. I have now run into the same problem in a 20 year-old Renner action/Grotrian-Steinweg studio piano. D4 and E4 were bobbling. I got them to stop, just barely, by tweaking the regulation. I will not be surprised if the condition returns. I assumed it was due to compaction of the buckskin/undercloth of the butt at the point where the jack pushes, leaving less compacted buckskin/cloth to interfere with the jack as it tries to clear the butt. I did not remove the butts to see if this was actually the case. My experience has been that C4 and F4 get more wear than the notes in between, so I have some doubt the compaction theory is correct. I am wondering if I could adapt the "bolstering the knuckles" technique with any success. That should change the shape of the buckskin, with associated re-regulation, enough to allow the jack to clear, I would guess. Bill Maxim Maxim Piano Service Columbia, SC wmaxim@sc.rr.com
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