Jack not returning on high treble

[PIANOTECHNICIAN at aol.com]

Check to see if the key moves freely - -ease the key bushings if not. Next,  
make sure there's enough lost motion in the key - adjust the capstan screw  
accordingly. Also, lubricate every center pin in that note with CLP. You have a  
few pivot points because of the inverted action. Lubricate the jack flange 
too.  Also, check to see that the jack spring is intact -- move the jack back 
and  forth by pressing on the 
jack's heel with a thin screwdriver blade while holding the hammer against  
the string - -in this way, you'll get a first hand feel about the spring  
tension. If there is little spring tension, replace the jack spring.
 
Jesse Gitnik
New York City
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