center pinning question

[David Ilvedson]

Don't know...maybe fluffing up the bushing?   I've have been doing a lot of repinning...I'm now in the 5 - 6 grams camp for hammer flanges.   How are you measuring your flanges...?

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Allen Wright" <akwright at btopenworld.com>
To: "Pianotech List" <pianotech at ptg.org>
Received: 5/14/2008 4:27:23 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