This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Differing opinions regarding the benefit of lowering pitch prior to = drawing a pinblock/backpost separation back together have been expressed = on this list. I am one that generally feels more comfortable lowering = pitch. I thought it might be of benefit to put some numbers on potential = pitch changes.=20 Yesterday I did one of these repairs on a late model (1980s) Baldwin = Acrosonic console. It had an approximate 1/4-inch separation between the = pinblock and the backposts and deadwood back assembly. The separation = had been "repaired" in the past with something that appeared to be = silicone bathtub adhesive - surprisingly (?) the separation appeared to = have widened since the application of the silicone. The piano was tuned = at that time (and presumably tuned at standard pitch).=20 Prior to my repair the piano was fairly uniformly 75 cents flat. I = dropped the pitch to between 200 and 250 cents flat prior to any = clamping. I yucked in West System epoxy thickened with #403 Microfibers. = (A fine fiber blend, is used as a thickening additive with = resin/hardener to create a multi-purpose adhesive, especially for = bonding wood. Epoxy thickened with microfibers has good gap-filling = qualities while retaining excellent wetting/penetrating capability.) I = drew the gap closed slowly going back and forth among the six 3/4" pipe = clamps (of which two got bent pretty good!). The separation appeared to = close very close to 100%. I then checked pitch again. Piano was fairly uniformly about 75 cents = flat. Therefore, it appears that closing the 1/4-inch gap resulted in a = pitch increase of approximately 150 cents. I will be going back to the job on Friday morning to install a few = through bolts, remove clamps, pitch raise and tune. If there is anyone = out there that perhaps has not seen this repair done (or whoever for = whatever reason) wants to see a few photos, I will take them Friday = morning. Let me know. Terry Farrell ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/f0/6b/ef/2b/attachment.htm ---------------------- multipart/alternative attachment--
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