Don, thanks for the wire you sent me. The 0.026" was perfect for this spring.
It is exactly the right stiffness to make this spring - flat, though, the caliper would pop right out, or the spring would lift up.
Can you see the the compound bends (in and out of the backplate) that I used to make the piano-wire spring work? I've made these for leaf springs in all size reels.

thanks again. I have wanted this reel working badly.
BTW, that's what's left of the broken bronze spring on the right.