Well, John, I'm dyslexic, but I can tell you that the length needed
usually exceeds the amount on hand by at least one inch!

By the way, if you need a use for short pieces of the tubing (like
one-foot sections), they are used in American Flyer steam locomotives
(1946-1950 approx.) with smoke in tender units!  The smoke devices in
the tender units also use bellows cloth.

David Dewey