This video might give you a little insight... http://www.youtube.c...h?v=pO_tEcdgGtg
There used to be a spring shop near here and I watched them make new springs many times. They would heat the end of the spring and turn the eye in a Hossfeld bender, then put the spring on the floor to cool. No heat treat. The springs were put back together and put back on trucks hauling rock or whatever.
They bought their spring stock 'pre arced'. Then they bent them as needed , cold, in a big press.
I have only made new springs for leg vises. I forge and bend hot. Let cool in air and put them on a vise. No breaking.
Go for it, this isn't magic.