We are working on a Schulz player (with pouch pneumatics) and the
valves need to be redone.  What materials should we use for the
valve faces and the valve seats?  Also, does anyone know how to test
individual valves with a bubble jar before reinstalling them?

It is very time consuming to disassemble this action and we would like
to know all valves are extremely tight before it goes back together.

Thanks,
Joseph Osborne
Carlisle, Pennsylvania, USA