As all of you are aware, I am in the process of restoring an
Aolian-Hammond Player Organ and have run into a problem with the vaccum
pump.  I have disasembled the pump and recovered all pneumatic with new
rubberized cloth.  The pump is a conventional four bellows vacuum
pump.  Each bellows has 24 exaust holes (1/2" diameter), set in pairs
of six each (6-6 space 6-6).  Each pair of holes is covered with white
gussett leather with a 2" X 5" heavy-duty rubberized flap tacked over
the pair of holes.  There is a 1" X 3 3/4" piece of felt glued in the
center of the flap.  The felt does not cover the twelve exaust holes.
My question is, what is the purpose of the felt?  I would think that
leather to leather would be a better seal on the exaust stroke.

Eugene Rogers