jack not returning on high treble

[piannaman at aol.com]

 A heat gun will speed up the process of drying.  Careful, cause you can burn parts....
 
Dave Stahl

 
-----Original Message-----
From: KeyKat88 at aol.com
To: pianotech at ptg.org
Sent: Tue, 23 Jan 2007 8:51 PM
Subject: Re: jack not returning on high treble


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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