[pianotech] Sticking key question

[Ron Nossaman]

> Wow, Tom, I've never heard of that, and I'm old. Are there particular 
> pianos in which this is the case? Or a particular time period? Or a 
> particular felt maker? Was it true for all sizes of upright pianos? 
> Inquiring (and old) minds want to know...
>  
> Paul

I don't know why it happens, exactly, but just being aware 
that the spoons can dig into the damper lever felt and jam the 
works is enough for diagnosis. It's another example of the 
value of tracking general principals over memorizing specifics.
Ron N