Just one note about testing -- you want to test the pneumatics very
well before installing anything.  I once used a cloth that didn't
adhere well to the pneumatics.  I forget which type, but it was
recommended as it's extra light.  They said to glue the cloth backward.

Anyway, the cloth failed me after a short while though I tested the
pneumatics very well.  I took it apart and tried a few pneumatics and
found the bond to the cloth very weak.  I then tried a new test:
instead of testing them by suction on the pieces, I tried by blowing
them.  Several failed, several passed.  Those that failed I cleaned the
cloth with rubbing alcohol and glued the cloth back in place -- then
they all passed both suction and pressure.

That piano is still functioning and even survived the Haifa fire (in
the NISCO museum).  From this point on, I always test with both suction
and pressure all pneumatics.  I also never tried to see if they would
close on their own weight, but no binding and easy movement is crucial.

Eli Shahar
Sonora, Calif.