[pianotech] stuck keys after one hour of playing

[Joe And Penny Goss]

My guess is the evidence of roughing of the center pin when iI look at it after removal. 
The rough edges grab the felt better when warmed or the glue used to hold the bushing expands during use
as friction warms the center.
Don't know, just know somthing happens that causes the player to complain, resulting in ------
Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com
  ----- Original Message ----- 
  From: paul bruesch 
  To: pianotech at ptg.org 
  Sent: Tuesday, March 31, 2009 4:06 PM
  Subject: Re: [pianotech] stuck keys after one hour of playing


  Sooo... it's like blowing on your hands to warm them, and blowing on your soup to cool it.  We heat center pins to loosen them, but when they get warm by (somewhat) extensive play, they tighten? Huh? Someone 'splain please?

  Paul Bruesch
  Stillwater, MN


  On Tue, Mar 31, 2009 at 5:55 PM, Bruce Dornfeld <bdornfeld at earthlink.net> wrote:

    Hello Barb,



    The first thing that I would look for is tight action centers, hammer or jack.  Sometimes they will tighten up when friction warms them.  



    Bruce Dornfeld, RPT

    bdornfeld at earthlink.net

    North Shore Chapter




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