Paul: I've often run into problems on Steinways with buzzing through the agraffes (even new ones) in different places in the piano. Most recently on a D this problem occurred in several places in the tenor and just below the bass break (not a string winding buzz). I have also run into problems with clean intonation on note 53 (last agraffe) and leakage throught the capo section is a constant battle. I have in the past remedied problems in the agraffe section by increasing the counterbearing angle by adding a brass semi round between the tuning pin and the agraffe. I have often considered when restringing to build up the string-rest felt as a prophylactic measure. In the capo section sometimes the problem is the shaping of the v-bar itself which can be remedied. But again, I have often wondered whether or not the tone/power might not be improved by building up the cast duplex. A hollowed out half-round of brass could be fitted over the cast duplex, or if the duplex needs to be detuned, it could be placed in a different position. My questions are: Is there an optimum amount of counterbearing? Is there a recommended way of building it up in the capo section when dealing with a cast duplex as in a Steinway? What are the downsides to building up the counterbearing, if any? And any other questions which I either haven't asked or haven't thought of. I would be interested to hear what you think. David Love >From: Yardarm103669107@AOL.COM >Reply-To: pianotech@ptg.org >To: pianotech@ptg.org >Subject: Re: Counterberaing angle >Date: Fri, 16 Mar 2001 20:49:09 EST > >David: >I've done a good bit of research on this over the years, and yes, many >pianos >need reassessment. The relationships between the angle, shape of capo, >friction/upbearing forces, tension between segments, etc. are all >interrelated and very complex. The same principles hold true for the other >end as well. What explicitly have you run into that leads you to this >question? >PR-J _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com
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