Knabe keyboard/bed problem

[R Barber]

I was wondering about those...  I think that whole system is intact, but 
was adjusted too far backward.   Thanks!
Richard

> Richard,
> 
> In each cheekblock you will find a notched-out screw, whose notch 
> engages a screw protruding from the side of the keyframe.  The purpose 
> is to maintain the correct strike-point (fore-aft position of action) 
> while allowing the action to shift side to side with una-corda pedal.  
> Something is damaged, misadjusted, or missing in this system.
> 
> Mike
> 
> R Barber wrote:
>> 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
>>