center pinning question

[erwinspiano at aol.com]

?? Hi Allen
? first things first.
? IS it an American Stwy?? If so factor in the vertigris equation.......if not .....nevermind.
? Dale


-----Original Message-----
From: Allen Wright <akwright at btopenworld.com>
To: Pianotech List <pianotech at ptg.org>
Sent: Wed, 14 May 2008 4:27 pm
Subject: center pinning question


In repinning an old (1930's) Steinway M, quite a few were loose. I found that replacing the old pins with the exact same size (but new) pins was producing just the amount of friction needed - and even in some cases adding too much, so that I had to ream with my "Mannino" burnishing files. Any theories on how that happens? Something to do with the nap of the cloth changing in the process, or perhaps the angle of the pin changing in the bushing, or (even more unlikely) that somehow only the outer edges of the pin are slightly worn on the old pins? (These are the various ideas me and my colleagues were coming up with to explain the phenomenon).



Thanks, and I'll take my answer off the air... ? : )




Respectfully,



Allen Wright. RPT




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