To quote the "83--"85 Player PIano Co. catalog, "The simple
construction of the H. C. Bay player offered nothing original.  It was
cheaply made and widely used in inexpensive pianos."

Cheap but effective may I add, and  must beg to differ.  I thought
the plastic valves were unique to H.C. Bay.

The one piece valves are  "molded plastic composition similar to the
old piano roll spool ends."  To me they look similar to Bakelite, and
show no signs of deterioration that other plastics have. A design so
simple it must have saved a considerable amount of production and
assembly cost.  Because of the way they are "adjusted" (by filing the
bottom ; ) they should go back in their original places.   The catalog
mentions accessing the bleeds through individual screws from the front.
That represents a quality consideration and would have taken a lot of
assembly time, instead of just pasting cloth over them, like most
others did.

If I remember right, the bottom seats were leather, and in  at least
two that I worked on they were in a remarkable preserved condition. If
these seats and pouches are good, that saves a huge amount of work.
Actually if the covers were fiber and they repeat and the valve
seating passes the pressure test, I would think twice about even
taking them out. It seemed that these plastic valves were "cleaner"
as compared to leather faced valves that sit on metal seats.  We were
pleased with the ease of rebuild, and the way it came out.  A pretty
good pumper.

Richard Moody