Fox18, a few thoughts. Springs should not get "tired" from sitting stressed for a long time. Note that steel bridges do not fall down after a few years. A spring which has yielded (proper name for getting tired) was most likely improperly heat treated (hardened and tempered). Springs are more likely to crack or break than to yield.
IMO, the spring should be annealed before any attempt to bend it/reshape it (bending equal yielding it further). I'd recommend against trying to redo this spring to save money. Spring making can be done at a relatively low tech level, but needs a bit of supervised experience for best/quickest results. If you want to learn to make springs, get some files, spring stock, and a heat source and get after it. Save this spring for in case you decide spring making is not your cup 'o tea. Mechanically inclined people usually find spring making not particularly difficult - a tad time consuming, yes.
DDA
