tapping strings

[Roger Jolly]

 and the pin doesn't climb
>out of it's hole"
>
>
Hi Ron,
        Do you have any proof of that statement?  Hydrolic action in soils,
causes fence and telegraph post to creep out of the ground.( very well
documented)
With humidity swings in maple, why would the same effect not exist?  High
humidity exerts pressure on the bottom and sides of the pin, and the top is
free to move.  Once you swing back to a low humidity condition, it's
possible for the pin to move, dependent on friction. but it can only move
up, and to the side that is being forced by the side bearing.

Just some fgoood for thought.

Regards Roger
Roger Jolly
Balwin Yamaha Piano Centres.
Saskatoon/Regina.
Canada.