buffing aggraffes?

[Ron Overs]

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Hello all,

Further to the contributions so far, I would agree with Ed that there 
is a risk with re-installing  fatigued agraffes. However, I have 
found that new agraffes are just as likely to have poor string hole 
profiles, so we re-cut the string holes even with new agraffes (we 
use a small mill/drill for good depth stop control of the specially 
profiled centre drill). The last new set we installed un-cut was 1994 
- a set for a Steinway D. At the time, I had been recutting original 
agraffes for some years but was never satisfied that they were 
perfect. There always seemed to be one or two which remained noisy. 
So I decided to use a new set for the D I was rebuilding at the time. 
The result was far noisier than the previously re-cut originals.

Following this disastrous outcome, I cut a couple of the surplus new 
agraffes in half through the string holes to inspect the profile. I 
was shocked to find that some had parallel sections through the 
string holes and other irregularities that I didn't care for. We've 
been re-cutting all new agraffes ever since.

In some cases we still retain the original agraffes when rebuilding. 
The early style Kawai KG agraffes were a much better design than the 
later offerings, which are much less robust with a larger minor 
diameter in the string holes. The smaller string holes seem to be 
less noisy, other things being equal.

Ron O.
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                  OVERS PIANOS
        Grand Piano Manufacturers
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Web:    http://overspianos.com.au
Email:  mailto:ron@overspianos.com.au
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