Hello,  I am looking to replace the mainspring in a friend's Reuge
airplane-shaped music box. The mechanism specifically runs 2 wheels
and the propeller. One wheel is the winder. Both ends of the arbor
are threaded.  It looks to be an 18-note mechanism. I don't know the
song it played.

Can you help me find a spring? All the parts are in good condition
except dirty.

Thank you,

Sam George

 [ Maybe "Come With Me In My Flying Machine"?  -- Robbie