Hi,

You asked:

> I'm curious if they are sealed leather puches-  would you know if they
> are and what type of sealant was used? Sometime ago,  the possibility
> of egg white diluted with water or "something else" was brought up in
> this group.  Any new input?

The pouches in the Wurlitzer "type" block valves sold by Player Piano
Co, used to have preformed polyurathane pouches. I don't know if this
was perflex or tuftane but it was 100% air tight.

When I replace these "plastic" pouches with leather, I glue a small
circle of paper over the original bleed hole and poke a smaller hole
in the paper with a needle to account for the increased porosity of
the leather.

Musically, John

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