Jack button punching compression

[vince mrykalo]

Barb, I would recommend crescendo let-off puchings from Piano-Forte Supply.
  
 
  From: "Barbara Richmond" <piano57 at insightbb.com>
To: "Pianotech" <pianotech at ptg.org>
Date: Tue, 30 Oct 2007 16:07:32 -0500
Subject: Jack button punching compression

        Howdy,
   
  I'm replacing the jacks in some Thayer wippens.  The replacements have really big, fluffy jack button punchings--which put the jack position too far forward and if I bend the spoon backward to get the jack back far enough, there isn't enough tension on the spring that's held by the loop on the jack.  (Follow me?).   Instead of trying to compress the questionable punchings on the jacks, I think it's easier to compress a set of replacement punchings that I have which look less wild than those on the replacement jacks, but still need compressing.  Then I'll simply replace the original poofy ones.  The punchings are on my bench, under a cutting board that is weighted down.  
   
  Here's the question--(drum roll):
   
  How long should I leave the punchings under the weight?
   
  This piano belongs to a friend and it will be a good project for her to replace the punchings.  Hmm, I'll have to think of a few other little jobs for her to do...
   
  Thanks,
   
  Barbara Richmond, RPT
  near Peoria, Illinois
From: John Ross <jrpiano at win.eastlink.ca>
To: Pianotech List <pianotech at ptg.org>
Date: Tue, 30 Oct 2007 18:35:02 -0300
Subject: Re: Jack button punching compression

        I'd be tempted to find a different punching.
  There appears to be at least 3 thicknesses available.
  Even after compressing, I don't think it will stay, unless you possibly dampen them, or something.
  John M. Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
  From: Roger Jolly <roger.j at sasktel.net>
To: Pianotech List <pianotech at ptg.org>
Date: Tue, 30 Oct 2007 16:53:51 -0600
Subject: Re: Jack button punching compression

Hi John and Barb,
                                   Shrinking the felt is OK to a point.  Upside, a little more stability for the jack position.  Downside, an increase in jack noise so be careful.  I suggest you experiment before you do all 88.    Usually there is some room to reposition the jack so take a careful look at this option.

Regards Roger 





      Vince Mrykalo RPT MPT
  University of Utah
   
  "Minél több a változás, annál nagyobb az állandoság"
   
  If you agree with me, it's too late.  I've already changed my mind.
   
  www.mrykalopiano.com




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