Throttle return and kickdown springs

Thanks for the replies here. I imagine there was/is a spec for these springs (wire gauge, number of loops, spring length etc) but I cannot find one anywhere so can only imagine it's not a big deal as long as the tension is not stupid enough to but strain on any pivots. My 1920 must be a '74 or later as it has the internal throttle return spring and I have read that the external return spring acts as a secondry as @volaredon rightly suggests.

I shall therefore wander down to my auto part store/ebay and see what I can find.

Thanks everyone.