The rebuild of our Cremona J is proceeding, but as an engineer I would
like to know the original factory spec for vacuum.  Expressed in inches
of water gage, 10 inches plays the piano well, but some of the other
functions like the soft pedal and coin shutoff do not fully operate.
At 20 inches everything works, and in between some work and some do
not.

At 15 inches, when some do not function, is that because there is not
enough vacuum, or is there a problem with the function?  If I knew the
correct vacuum spec I would know what to work on.

Thanks for your help.

Scotty Greene - DeBence Museum