Hi all.  Well I should have opened up the pouch chest shouldn't I?
The blow/suck test is OK as far as it goes but a better one is probably
blow/blow.  That way if the pouch does not return to its rest position
it is more apparent.  I live and learn.

Anyway, I now have the pouches to re-cover.  They were very thin and
crinkly.  The valve leather that I referred to as Zephyr skin is
perhaps more correctly called Tan Skiver.  It is the same as pouch
leather.  I think now that the valves are fine.  Thanks to all.

Roger Waring