I finally found well made (specially made on tension specs) non rusting or oxidizing springs that will fit a Martin, Bon Cajun or Acadian type accordion. Alas they're pretty expensive at around 50 dollar cents a piece. You will need to bend one loop slightly open with a Martin f.i. to get a medium tension on the buttons, giving that resistant feel giving away in a sort of "pop down manner" once you push a little harder, and closing the flappers pretty fast on release. I have to buy them by the 100, but if some one wants a few, mail me. - Nout

I have made the springs from music wire and from a safety pins. The problem with my Arriette is it is a cheap box and the buttons are glued on, so you have to twist them off to pull the rocker lever.

Then you have to align the buttons carefully so they do not stick when you glue them back in.

Also, it is hard to make a spring that has the exact force of the one you are replacing.

Good luck