shim strings to cure buzz?

[piannaman at aol.com]

Hi David,
 
I was going to do this on a new Bohemia Grand, where I had deduced that the string was indeed contacting the bridge just beyond the pin.  I decided to try lifting a small bend in the string just beyond the pin before trying a shim, and it worked.  Might be worth a shot. 
Dave Stahl

Dave Stahl Piano Service
650-224-3560
dstahlpiano at sbcglobal.net
http://dstahlpiano.net/




 
 
-----Original Message-----
From: dnereson at 4dv.net
To: pianotech at ptg.org
Sent: Wed, 7 Feb 2007 8:50 PM
Subject: shim strings to cure buzz?


        Encountered some buzzing treble strings on 1961 Challen 5' grand.  The board had a little crown, but there was no downbearing.  I think a few of the strings are buzzing on the bridge because of no bearing.  Has anyone tried inserting very thin shims under the strings, on the bridge top, to give them some bearing?  I realize this might changes the termination point on the bridge pin slightly and false beats may result.  If so, could maybe the bridge pins be pulled, the holes plugged, the veneer glued on (or just placed on), then the bridge pin holes re-drilled??  It's only 4 unisons or so.  The buzzing strings are on either side of a plate strut, and the ones on the right are under the capo whereas the ones on the left have agraffes, so I don't think it's grooves in the capo.  No splits around the bridge pins.   I guess I could go farther and re-cap just the portion of the bridge that's low, but it would be difficult to do in the piano.  
      David Nereson, RPT  
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