As luck would have it, I just finished restringing a Yamaha C3, circa 1970 or so, that had been CA'd. I made cuts directly through the tuning pin holes on the old pin block to look for the effects of penetration of the CA glue into the holding area of the tuning pin. There wasn't any. Most of the glue splayed out across the top of the pin block just under the cast iron plate. This particular piano had tuning pin bushings and they were encrusted with all kinds of glue in the applied area. I summarized that the glue saturated the tuning pin and the tuning pin bushing gluing the bushing to the plate. That would be the beneficial part. There had to be bushings that bonded to the tuning pin but not to the plate. This would increase friction which would be beneficial but most likely not enough to warrant the procedure. In short, CA glue effectiveness is reduced if it's not injected or wicked into the tuning pin hole in the pin block. Oversize pins could buy you 20 years or more providing the pinblock hasn't delaminated. Yes, that makes tuning the piano a wee bit more of the challenge, but at least it's not a 4' 8" with plastic mallets for hammers and an action full of rodentia!!! Larry Fisher -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090111/51596815/attachment.html>
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