[pianotech] repin CA'd pinblock

[Ed Sutton]

Fenton and Al,

This question comes up regularly. On a previous round, I asked if anyone can report first-hand knowledge of a pinblock that was ruined by CA glue, and so far no one has answered yes.

Putting in scattered over-sized pins or sandpaper shims makes it very difficult to repin the full piano later. Tapping down the pins is a one time temporary fix at best, and it can seal the plate webbing, making it difficult to apply CA. Therefore I feel that "coping" is best done with CA glue. 

 I prefer small applications. After the first treatment, I mark the jumpy pins as I tune. When tuning is done, I check pitch of the jumpers, and add 2 or 3 drops for insurance.

When I cut open old pinblocks, the CA seemed to have formed a collar around the pin, which flaked off rather easily. I don't care what the CA sticks to, as long as it holds the pin.

Ed Sutton
  ----- Original Message ----- 
  From: Al Guecia/AlliedPianoCraft 
  To: pianotech at ptg.org 
  Sent: Sunday, January 11, 2009 8:28 AM
  Subject: Re: [pianotech] repin CA'd pinblock


  Fenton,

  I have restrung a piano that was treated with CA glue and didn't see any ill effects. What I did and also do with any piano I restring, was to ream the TP holes with the proper size reamer for the new TP I am going to use. I do this to clean the hole and for uniform tightness with the new tuning pins.

  Al

  . 
    From: Fenton Murray 
    Sent: Saturday, January 10, 2009 7:03 PM
    To: dave at davispiano.com ; pianotech at ptg.org 
    Subject: [pianotech] repin CA'd pinblock


    List,
    The patient is an early 80's grey market Yamaha C7 doing duty in a recording studio. An other wise decent piano, the tuning pins have been driven down and are still low in torque. This is a piano that might benefit from a restringing with larger pins latter, but now I'd like to hear from someone who has restrung a piano with a block previously treated with CA. I'm thinking of treating this block, but would like to not kill the option of a latter simple re-string on a relatively young piano.
    Thank you,
    Fenton
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