[pianotech] Bridge agraffes FYI

[David Love]

I would be surprised if the area behind the aggraffe (hitch pin side) was
the source of falseness.  Unless the aggraffe itself had deteriorated (which
it well might have) I don't think any small angle change resulting from some
crushed wood would be the source of poor termination.  The capo section
might well be a source (see attached photo).  

David Love
www.davidlovepianos.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Encore Pianos
Sent: Thursday, October 25, 2012 4:20 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Bridge agraffes FYI

I have a couple of these in my service presently here in New Hampshire, and
have had others in the past.  

These bridges probably sounded pretty good in 1925 when they were new, but
as they age, they can become insanely, incredibly false.  This I would
attribute to the deterioration of the bearing surface of the maple just
behind the agraffe where the string presses into it.  The strings literally
crush the surface reducing the angle of deflection of the string as it exits
the back of the agraffe, and an insecure termination and the falseness is
the result.  I have heard these problems on a number of these agraffed
sohmers, mostly the (stupid) cupid grands.  So I attribute that to a flaw of
the design rather than an isolated incident.

Living in New England, I am in a harsh environment for pianos with dry
winters and humid summers, so perhaps I see more deterioration than you do,
in your more benign environment.  

Will Truitt 


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