From: Jim Busby Sent: Thursday, May 21, 2009 10:36 AM To: 'caut at ptg.org' Subject: RE: [CAUT] M&H "A" stability Hi Alan, I think you're right. I also think that my felt was too thick and presses too much, furthering the problem. See the attached picture. I'd like to see a picture of the brass. Please!! Regards, Jim -----Original Message----- From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Mccoy, Alan Sent: Wednesday, May 20, 2009 10:44 AM To: CAUTlist Subject: Re: [CAUT] M&H "A" stability Hi Jim, If it is anything like the BB I rebuilt a couple years ago, it is the extreme counterbearing angles. This BB is from the 70s, you know the ones where the angle is over 30 degrees?!! I ground the plate as much as I could to lower the angle, and in the capo sections to reduce the duplex length. The piano has always been a bear to tune. Now it is less of a bear, but there is one section still that is exhibiting the symptoms you describe. The upper two capo sections are fine, as are the agraffe sections, but that first capo section, where most pianos have agraffes, is the problem now. I ground that section down as much as I dared (the plate was pretty thick there) but the angle is still more than I'd like. I put in a brass half-round bearing there to take the load instead of felt, and that helps too. Just needs more help. I go over that section several times each tuning. I'm hoping one of these days it'll settle down. I have some before and after pictures at home. If you are interested, I'll send you some. Alan Photos at: http://tinyurl.com/qkpsot http://tinyurl.com/p38k6q http://tinyurl.com/p3gtrk Original links: http://ptg.org/pipermail/files/attachments/20090521/07061452/attachment-0001.jpeg http://ptg.org/pipermail/files/attachments/20090521/f0753834/attachment-0002.jpeg http://ptg.org/pipermail/files/attachments/20090521/f0753834/attachment-0003.jpeg
This PTG archive page provided courtesy of Moy Piano Service, LLC