Facts and nots : was Recommend Rebuilder?

[Ron Nossaman]

> Speaking of compression boards.
> What I can't comprehend, is the fact that compression ridges, are 
> apparently ok, by some.

When you count on panel compression alone to form and maintain 
crown, compression ridges *have* to be ok.


> How can they figure out the crown?

They can't, other than very generally. It will differ from 
piano to piano.


> Do they know how much of a compression ridge there is going to be, and 
> allow for it?

Allow what for it? The ridges are like the crown - a surprise. 
They're a result, not a method.


> This seems to me to be impossible.
> Or is there something, I am missing?
> John M. Ross

Welcome.
Ron N