Rarely is it necessary to replace the bleeds when replacing the pouches
in a player action. This is true even if you're replacing old, "tight"
leather, with new, "leaky" leather, or even replacing zephir skin with
leather. The key lies in SEALING new leather pouches with a couple of
coats of diluted, rubber cement in order to render them virtually air-
tight. The most commonly used rubber cement is Carter's and it should
be thinned 50/50 with either naptha or Carter's own thinner. After the
rubber cement has dried, SOP is to lightly dust the pouches with talc
(blowing off the excess) in order to overcome any residual stickiness.
Sealing the pouches obviates any need to fiddle with the bleeds. In fact,
the most common reason for replacing bleeds is because they've been
"fiddled up" by someone who either enlarged them while attempting to clean
them, or replaced them previously with the wrong size! So make life easy
for yourself and seal the pouches rather than replacing the bleeds.

Les Smith