I am in the process of adding a bass drum to my self-built Wurlitzer
Style 105 band organ.  Not having the desired result when using a
solenoid, I am now going the traditional route and using a bellows to
activate the beater.

Can anyone can suggest a source of spring steel to use when fabricating
the bellows spring?  Also, what is the thickness of the steel?  Any ideas
concerning this phase of construction will be appreciated.

Regards,
Burl Updyke

 [ You might use a door-spring (which is inexpensive and available at the
 [ hardware store) until all the other problems are solved.  Then you can
 [ measure the force and make an equivalent using clock-spring steel.
 [ Be sure to provide adequate valve port area, such as with multiple
 [ valves in parallel.  -- Robbie