jack not returning on high treble

[KeyKat88 at aol.com]

Greetings,

           Is or was recently, the piano in question in a moist situation? 
What you describe (jacks not returning or sluggish return) sounds as if the jack 
center pins are tight because their felt bushings are swollen. This swollen 
condition occcurs after/during a humid summer, or after a carpet is shampooed 
or plaster work has been done where the piano has absorbed moisture. In the 
winter this is unusual, unless such work has been done, One piano at an arts 
school WHERE i TUNE IS  above a steamy kitchen classroom and it has this problem, 
in fact the whole paino went slightly sharp.

 THe solution is to take a syringe and mix 1:10 alcohol to water and from 
each side of the jack wet it. After this the problem will actually be worse, 
until the bushing dries out and shrinks in about 24 hours. When it dries, the jack 
should be freely moving.  (that is if it is an over moisture problem). 

JUlia Gottshall 
READING , PA


In a message dated 1/23/2007 11:10:1 PM Eastern Standard Time, 
michelle at smithpianoservice.com writes:
Hi everyone.  I briefly worked on a drop action piano today (the type with 
capstans and inverted stickers instead of lifter wires and grommets) that the 
jacks would not return after the initial strike.  We see it every day, right?  
Well, I did a multitude of tests to see if it was a friction issue.  It wasn’t. 
 I didn’t have a lot of time to make adjustments (I was there to work on a 
different piano) but here are two facts to ponder.  First, it was ONLY the notes 
that do not have dampers (the extreme treble).  Second, the dip on these 
notes was slightly less than the rest of the piano, otherwise, all measurements 
were the same.
 
Thanks for helping the eternal newbie.  =)
 
Michelle Smith
Bastrop, Texas
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