[pianotech] Weber Upright Pinblock

[John Ross]

When I noticed the problem, the symptom was 'jerky' pins, that would hold, but hard to get the exact tuning point.
One fix that was suggested, was to swab the hole with C/A to seal it.
I tried it, wasn't satisfied with the result.
Young-Chang changed the piano with no squabble.
I missed the bit in the original post, about it being the bottom row.
So, larger pins will not work.
The fix I would suggest is pinblock plugs, since it is probably only a few.
Webb Phillips sells them.
John Ross
  ----- Original Message ----- 
  From: Dave Davis 
  To: pianotech at ptg.org 
  Sent: Thursday, February 26, 2009 6:11 PM
  Subject: Re: [pianotech] Weber Upright Pinblock


  Hi Wesley,

  I ran across this phenomenon a few years ago. Phil Glenn, formerly with Young Chang, told me that in the late 80's the drill bits YC used to pre-drill for the pressure bar screws were changed to a slightly smaller size. They later discovered that the guy putting the screws in put silicone on the screws so he could drive them into the smaller hole. Consequently the silicone creeped up the pinblock and typically the bottom row of holes of those pianos would become loose. 

  CA probably has the best chance of extending the tuning life of the Young Chang-built Weber. Replacing the tuning pins or driving them deeper won't help. The only real cure is to remove the silicone, which would require removing the pinblock.

  Best regards,
  Dave Davis, RPT



------------------------------------------------------------------------------
  From: Wesley Hardman <whardman at scottsboro.org>
  To: Pianotech List <pianotech at ptg.org>
  Sent: Thursday, February 26, 2009 11:31:33 AM
  Subject: [pianotech] Weber Upright Pinblock


  The piano is a 1990 W48 Weber Upright that is located in the choir room of the church building.  The tuning pins of the bass section are tight.  The pins in the tenor section are loose to the point that a few are not holding tune like they should.  Most of the bottom pins of the treble section are on the verge of being too loose.

  There is a climate control system in the piano that has not been in use for who knows how long.

  Three recommendations have been made by other technicians as to how to best address this problem:
  A.  Replace loose tuning pins with one size larger pins
  B.  Drive pins farther into pinblock
  C.  Treat with CA glue

  What is your recommendation?

  Thanks,


  Wesley Hardman
  Scottsboro, Alabama
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