replacement hammer butt springs

[John Ross]

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Hi Terry,
My understanding was, that the felt hadn't been rinsed properly, and something acidic, was left in from the felt making process.
The corrosion, on the point of contact was plain to see.
I seem to recollect, that it was mainly Story & Clarke and Lowery, that had the problem. They would supply a new spring rail, and pay labour as well, for the fix.
I seem to remember the actions being Pratt Read?

John M. Ross
Windsor, Nova Scotia, Canada
jrpiano@win.eastlink.ca
  ----- Original Message ----- 
  From: Farrell 
  To: Pianotech 
  Sent: Thursday, August 05, 2004 9:44 PM
  Subject: Re: replacement hammer butt springs


  Funny you should mention bad felt John. Just last week I spent a day doing some refurbishing on an old original M&H upright from the 1890s - quite respectable shape for its age. I was putting all new felt on the keyframe and leveling keys, but the lady wanted to minimize costs, so the key bushings were OK and I figured I would not do anything with the keypins. Upon removal of the center rail pin punchings, I noticed that the center rail keypins were all corroded just at the bottom where the felt punchings were. The front key pins were fine - no corrosion. But the center rail pins were trashed - I had to replace them. Bottom line though, I can only assume the two rails had been exposed to similar environmental conditions for the past 110 years, but only the center rail pins corroded - likely the felt punchings I presume? I wonder what it could be about the felt that would cause corrosion like that.

  Terry Farrell
    ----- Original Message ----- 
    From: John Ross 
    To: Pianotech 
    Sent: Thursday, August 05, 2004 8:23 PM
    Subject: Re: replacement hammer butt springs


    Hi Elwood,
    I suppose those repair springs might be ok, in an emergency.
    But, I would recommend, installing the proper new springs on the rail. If some are bad, the rest are on the way.
    If you do replace the springs, make sure to remove, any felt that might be there. Impurities in the felt, was what caused the problem, in a lot of pianos from the late 70's and 80's
    Regards,
    John M. Ross
    Windsor, Nova Scotia, Canada
    jrpiano@win.eastlink.ca
      ----- Original Message ----- 
      From: Elwood Doss, Jr. 
      To: Pianotech List 
      Sent: Thursday, August 05, 2004 8:48 PM
      Subject: replacement hammer butt springs


      Anyone have any good ideas regarding installing repair hammer butt springs in an Acrosonic spinet?  I have the kind of springs that has a flat plate (really small) with a slot in it for placing a screw in it.  Anyone tried using thick CA glue or that new "gorilla glue" to attach it to the hammer butt spring rail?  Just wondered.
      Joy!
      Elwood 

      Elwood Doss, Jr., RPT
      Piano Technician/Technical Director
      Department of Music
      145 Fine Arts Building
      University of Tennessee at Martin
      Martin, TN  38238
      731-881-1852

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