In Digest 970603 Craig Broughter wrote:

> One requirement to rebuilding the Schulz valve is to make sure the
> valve pneumatics easily collapse on their own with the hook in place,
> and are practically air-tight.  You have to be able to open them up and
> watch them drop quickly on their own weight.

Craig,  I rebuilt a Schulz quite a few years ago and you are right about
this.  I redid it 4 times before I had everything right with the pouch
pneumatics.  At that time I used a material from Player Piano Co. called
Schulz pouch cloth.  It was a very thin 2 layer pneumatic cloth.  I
don't believe this is available any more.  What would you suggest using
to cover the pouch pneumatics today ?

Thanks,

Bob Conant