Check with any small engine shop. Broken recoil stater springs are a
dime a dozen. The size you are looking for is common in the larger (8hp
and up) engines.

Jordan wrote:
I need some flat spring steel and wonder where I could find it, maybe
off some old equipment.
Needs to be 1/2 inch wide, 1/16 inch or so thick, and only a couple of
inches long.
That's wider than any clock spring I've seen, and have been trying to
remember if I've seen anything like that, I could scavenge?
Do those "recoil start" lawnmowers have such a spring?

Jordan