[CAUT] abel action centers seizing

[Joseph D. Gotta, RPT]

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Ed,
      I believe this is caused by sizing the bushings, dipping them in a
solution of alcohol and water or soapy water or whatever, premature to
the bushing cloth glue drying. The result is that some glue made it
through to the center pin. Somehow, and I'm not sure how, heavy use
accelerates this problem. Perhaps the sizing solution was such that the
glue never hardened and the heat of the heavy repetition drew the glue
to the pin. I've seen this on an older Petrof and some Korean pianos.
All are in high use. When you pull the center pin you will see residue
on it. Protek works but is VERY temporary in this case. I have simply
repined all the seized flanges I've encountered and have yet to see a
reoccurrence.  The pianos I deal with that have this problem have
reoccurrences in other flanges at a rate of about one per year. I find
they serve as a good reminder for the client to have their piano tuned
again. As far as I can tell repining is a long term cure for this
problem and rebushing or flange replacement is not necessary. Does Abel
offer any warranty?
 
Joseph D. Gotta RPT
 
-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of Ed
Sutton
Sent: Saturday, June 11, 2005 6:14 PM
To: caut@ptg.org
Subject: [CAUT] abel action centers seizing
 
 
Dear List-
 
Last summer I rebuilt the action of a Baldwin SF-10 using Abel Encore
shanks and flanges. (I also used Tokiwa wippens with adjustable assist
springs and made strike weight and front weight continuities.  Results
were very good.)
 
This was the student piano in a teacher's studio,  so it has had about
20 hours a week with student playing, and the teacher used it for
practice as well.
 
Last week the teacher complained of "slow repetition" on 3 mid-range
notes, which were caused by the action centers seizing at the hammer
flange.  They give an audible squeak when moved!
 
I understand this was a  problem a few years back with Abel flanges,
supposedly not happening any more.
 
Can anyone share knowledge and experience on this....if anybody's
home...
 
Thanks!
 
Ed Sutton
 
 
 

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