Dear folks,  I am looking for a flat spring that would go inside a
pneumatic bellows to force it open or hold it open.  These are often
used in exhausters or regulators or similar medium to large bellows.
With the demise of most of the supply houses, I don't know where to
look for this part.

This is not for any specific piano manufacturer as it is for a project
I am working on.  I need it to go inside a bellows of about 12 inches
by 8 inches with a span of about 5 or 6 inches.  When the bellows is
collapsed by hand it will blow several small pipes; then I want it to
reopen by the force of the spring.  Is that clear as mud?  Any
suggestions?

Thanks,

Bob Conant
Bradenton, Florida