Customer has a Knabe Grand, around 6'6", ~80 years old. In highest octave of damper'd notes in the treble, playing the note will make two dampers rise, which then proceed to stick, falling slowly when the note is released. One thing I noticed was that the whole action was about 2mm from the front of the keybed, and when I pulled it back out so it meets the keyslip, the damper sticking problem was solved. My guess is that the keystick in the back is pushing up a few damper levers, and catching the side of its neighbor's lever. Another problem is that the keyboard shift happens a little diagonally, and the action might be creeping its way backward over a few days of shift, so the problem with sticking dampers has shown up again. Dampers all seem fine, no friction issues. Any hints would be appreciated, Richard Barber Santa Clara Valley, CA
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