The very first player I ever rebuilt was one of these.  The pouches and
bleeds are built into the pneumatic.  In a way it makes it kind of easy
since all of this is immediately accessible once the pneumatics are
removed from the deck boards.

Apparently a lot of them had those bleed access screws but some
did not.  In some cases the holes were sealed off with the pneumatic
cloth and inaccessible, as was the case with the one that I had.
I think these would be handy to clean out the bleeds should they ever
get clogged.

I don't have any suggestions in terms of removing the pneumatics;
on the one that I did they were already falling off.  I do recall,
however, that Kimball put a layer of newspaper between the pneumatics
and deck boards for easy disassembly which was true in my case.  It was
kind of interesting in that if you looked carefully you could make out
some of the news of the day in the 1920s provided it wasn't too
destroyed after taking it apart.  When I reassembled mine I replaced
the newspaper in courtesy to the next guy who may even be me.

Those threaded Bakelite valve seats with the slot are pretty cool.
It takes no effort to regulate valve travel because it is instantly
adjustable.  Once they are where they need to be they get sealed around
with beeswax.  Mine had no shellac.  I had a discussion about these
with an organ technician recently.  Apparently Kimball used these on
some of their big theater organs too.  He told me that the ol' timer
organ techs called them "nickel valves" because all the technician had
to do was reach into a pocket, grab a nickel, and put it into the slot
to adjust them.  The wax only needed to be heated to reseal them.

If they are breaking I don't know what to tell you.  You might try
warming them with a heat gun first to loosen them.  Perhaps someone
on MMD has some spares or an orphan stack from an unsalvageable piano?
I pray for your sake the piano doesn't have one of those built-in
keybed pumps.  Mine didn't but years ago I saw one.  It looked like it
would be a nightmare to rebuild.

Rob Goodale, RPT
Las Vegas, Nevada