This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment I had a customer complain about the touch on their Yamaha grand and = discovered that it weighted off at 66 grams at middle C. When I checked = the hammer flange I found that I could only get one swing, and that the = bushings had a black residue on them. Closer inspection showed that this = residue was also on the center pins as well as slightly in the wood = surrounding the bushings. The residue on the pins themselves rubbed = right off, and the pins looked shiny and new without any signs of = buildup or corrosion. I repinned one to normal tolerances and the cloth = felt as if it had normal resiliency, and the downweight dropped by 11 = grams. I also found that the wippen flanges had the same residue, but = hadn't seized up the way the the hammer flanges had. They seemed to be = *slightly* on the tight side but still within normal tolerances (I = didn't have my little spring gage with me). The jack & rep lever = bushings were normal bright red cloth, and perfectly free. I have an appointment to return and repin this action, but before I do = I wondered if anyone else has run across this before. Could this be = something that Yamaha did at the factory? although I've certainly never = seen it in their other grands, this is the first S series grand that = I've serviced. The customer bought it used last year and so doesn't know = it's history. Does anyone know of any center pin lubricants that react = in this way? Is the problem likely to return after repinning? The serial = # is: U3894763 Thanks,=20 Mark Dierauf ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/2c/dd/0a/b6/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC