M and H 50 inch upright puzzler solved 1 1/2 years later..../Bob got it!

[Piannaman@aol.com]

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Bob,
 
Good call.  The sostenuto operates by metal stickers protruding from  the 
bottom of the damper levers sticking into the sostenuto rail(comprised of a  felt 
strip which is attached to and stretches across the back of the action  below 
the dampers) when the sost. pedal is depressed.  
 
It felt as if something was blocking the movement of the action, and it  was. 
 The stickers (looking just like nails coming out of the bottom of the  
damper levers) were pushing against the felt when notes were played  individually, 
and when the sustain pedal was depressed.  
 
Once I got the felt out of the way, the piano played like new.  With  the 
action in the piano, it was impossible to see anything amiss.  When I  tilted the 
action forward to check for blockage, that  action immediately freed up, as 
the sostenuto rail was out of the way  of the maladjusted lift rod.
 
In the blink of an eye, a piano that was thorn in my side became  a rose!  
 
Thanks to all for the input, and past suggestions on this,  
 
Dave Stahl
 
In a message dated 1/24/2006 9:34:18 A.M. Pacific Standard Time,  
BobDavis88@aol.com writes:

 
This model in later years had a sostenuto.  Is it set too high in its rest 
position?
Bob Davis
 
In a message dated 1/24/2006 7:27:13 AM Pacific Standard Time,  
Piannaman@aol.com writes:

Excessive keydip, yet not enough  aftertouch!
Bobbling hammers throughout the piano, except  for the high treble
Spongy feel, as if the felt punchings were  really spongy, yet the keys were 
not even contacting the  punchings.
Key/action movement felt blocked about halfway  through keystroke.
 
Checked key height, seemed excessive at around  65mm, but in the end it 
checked out
okay
Key dip was okay.
Clearance in all possible affecting  rails(damper stop, sticker, and jack 
stop rails)
 
Clue:  This problem is probably unique to  this particular type of  piano.






 
Dave  Stahl

Dave Stahl Piano Service
650-224-3560
_http://dstahlpiano.net/_ (http://www.dstahlpiano.net/) 

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