Begin forwarded message: > From: John Ross <jrpiano at eastlink.ca> > Date: September 5, 2010 12:26:33 PM ADT > To: toddpianoworks at att.net, pianotech at ptg.org > Subject: Re: [pianotech] (no subject) > > I think the tuning pin holes are glazed, causing jerkyness in the pins. > The holes were drilled with a bit that was allowed to become too hot. > Another possibility, is the pinblock is contaminated. > Young Chang had a problem, where silicone used to install the plate screws easier, and it migrated through the block to some pins in close proximity. > John Ross > Windsor, Nova Scotia > On 2010-09-05, at 12:12 PM, toddpianoworks at att.net wrote: > >> I went to tune a Knabe grand yesterday. On this piano, I decided to drop pitch a little before bringing up to pitch. When I lowered tension on the monochords, I heard a loud snap followed by the pitch dropping drastically. >> >> I have encountered an upright that did this and I was curious as to the reason why. >> >> Thanks! >> Matthew >> Sent from my Verizon Wireless BlackBerry >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100905/295e6a5c/attachment.htm>
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