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 >
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