Doug Rhodes asked about "flexible" hide glue. Actually, it doesn't have
to be "flexible." Believe it or not, Hide Glue works just fine in
lapping cloth around open hinge pneumatics. I have used it in Seeburgs,
Duo-Art accordion pneumatics, Schultz pouch pneumatics, etc. It works
just fine. No problem, and nothing to add to make it "flexible." Of
course, consistency is important. You wouldn't want to apply the glue
with a putty knife, or make it so thin that it disappears into the
cloth, either. A nice, neat, smooth lap joint is all you need. Use as
little glue as necessary to make a safe seal. It is the best there is.

Craig B.