center pinning question

[Allen Wright]

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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