Thingy springy

Anyone experienced a broken carburetor return spring? It happened to me no less than 4 times. This final replacement is already 3 years old. It suddenly snapped during normal cruising. The engine gave a loud revving sound and it was almost impossible to drive. Since then a piece of sponge (car wash type) will always be an extra item in the car, just in case it happens again. I looked for the original spare but to no avail. The spare part dealer only seems to be interested in larger and easy to sell items. There is this shop selling dealing in all types of springs for machinery. Selected the spring with acceptable tension (unless you are a heavy footed person) and correct length. Installing it can be a nightmare because of the springs location. Steady hands and a lot of patience needed. It worked but there is always this thing bothering you ... when will it snap again.