humidity, teflon, hell, jon, whateve:

[A440A@aol.com]

 jon  writes:

>Holes get smaller in high humidity. Wood expands, not holes (no wood),
>so the wood expands into the hole or crushes around a tuning pin or bridge
>pin.

  I'm with you there..
>>Clicking noises in teflon bushings are usually heard in the dead of summer.

Starting to lose me........
>
>That would account for the yoke shrinking and the bushing becoming loose.
>the Teflon bushings get looser in damp weather. Joe Biscelli (sp) 
demonstrated
>this at a seminar by placing a teflon s/f in a glass of water for 20 
>minutes. It was excessively loose.

  Ah,  lost.  The changes the teflon shanks see are a lot more subtle than 
the glass of water.  However, if you were to put that shank in the water 
before you drill that hole, you would find that teflon bushing fit snug and 
evenly in damp weather, but was oblong in the dry season and would do its 
clicking at Christmas.  The wood hole is only round in one humdity, and 
distorts the teflon when opposite conditions are there.  (least, it seems 
that way to me).  Some of those pianos had problems in summer and some were 
loose in winter.  It did seem to vary by instrument.  
     When I soaked the ends of shanks in penetrating epoxy, and then later 
installed the teflon, the bushings never changed, (8 years on a concert stage 
at Vanderbilt).   Joe Bsicelli saw them and told me that it worked but since 
it changed the color of the wood, they would never do this at the factory.  
   It won't be long before this is an entirely moot point, the teflon actions 
are disappearing quite nicely. 
Regards, 
Ed Foote