So Jim, others, What's the real fix? File the buckskin, iron it, reglue it, water shink it (with distilled water)? I've had that "hump" and never found a quick way other than what Vinny said, or by tweaking the regulation. If only a few are bad ones, were they defective from the beginning, or did too much lost motion cause the jack to pound the hump there? With 337 uprights (203 of them Yamahas) you can see how this might interest me. Thanks. Jim Busby BYU -----Original Message----- From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of James Ellis Sent: Monday, April 19, 2004 1:53 PM To: caut@ptg.org Subject: Re. Bobbling hammers on Yamaha upright Yes Vince, changing to a thicker butt felt, and then re-regulating, might stop the bobbling, but it's not the fix I would like to see. That would also change the leverage ratio a little bit. The ratio is just fine the way it is. The problem is too much of a hump at the very front of the butt leather, making the jack have to move too far out before it will clear. This is the only Yamaha upright that I tune regularly that does this. It's about two years old, in a church chapel, and does not get used a lot, so it's not a matter of wear. As I said, the funny thing is, a few hammers do it badly unless I pound hard and really knock the jacks way back at let-off. The others don't, no matter how I play. Everything is lined up right on the money. At full key-stroke and let-off, neighboring jacks line up perfectly - same distance out. One bumps the butt leather, but the other does not. The other funny thing is, no one has complained about it. I don't think they even notice it. Next time I tune it, I expect to find a few more bobbling, at which time I will fix it. I'm glad I read all your various posts on the subject before it came time to tune this piano again. This is the first time it has started doing this. Having read your posts, I looked closely to see what was going on, and that's what I found. Thanks, Guys, Jim Ellis _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives
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