Greetings automuse,  I am sure to get hell for this but I don't think
there is any problem using PVCE glue for cloth in any place in a
pneumatic action.

PVCE is not like white glue when it comes to regluing.  It scrapes off
easily without the need for sanding.  I find it much easier to prepare
a surface that was glued with PVCE than one that was glued with hot
hide glue.  It is not a very strong glue but it holds well enough for
pneumatic fabric.

I think that hide glue is actually going to cause more instruments to
be abandoned in the future due to the difficulty of removing it from
anything but new and properly glued surfaces.  Most instruments that
still remain have been rebuilt once before and the gluing that is done
by most people is not the professional job that was done at the
factory.  I cringe when I have to do a re-rebuild.

Whatever mess one might do with PVCE glue can be easily repaired by
future rebuilders.  Not so for white glue or epoxy, used in the wrong
places.

I just finished rebuilding my Duo-Art stack and used nylon on the
strikers with PVCE glue.  I should have replaced the pneumatic boards
but I didn't, and probably made more work for myself.

I assembled the stack decks (it is an upright) in a way that they
should have been assembled originally.  I installed threaded rods
through all three sections and used polyethylene and silicone sponge
as gaskets.  I made flanges that hold the rod and it all comes together
with nuts.  No need for seal cloth and it is absolutely airtight and
will be simple for the next rebuilder to disassemble.

I also put the pneumatics on with screws, for the same reason.  I might
be the next rebuilder, when I am 90 and don't want to be sanding and
soaking hide glue in my old age.  This was a lot of extra work, but
worth it.  I used some more plastic sponge as gaskets which will
certainly raise some objections, but it is better than leather and
someone can always replace it with glue if they feel so inclined.

I just got the thing working a couple of hours ago and it is probably
the best Duo-Art I have heard in spite of the modern materials,
or possibly because of them.

Best regards,

Spencer Chase
Garberville, CA
http://www.spencerserolls.com/