Fabricating a return spring for Huret Jubilee Derailleur

I have a fairly similar Huret, in fairly tatty condition, but complete with spring. Yours for the price of a pint, if you want to try and meld them together.

Hi fruitbat,

That would be most generous of you; I may very well take you up on that offer when I have the derailleur to hand, and can tell exactly what form the spring takes.