On smaller springs (3/8" diameter wireor less) I place a round rod (3/4" or whatever the spring will slide over) in the hardy hole of my anvil (my anvil is attached to a stump in the ground), heat up the spring, toss it over the rod, grab the bottom end of the spring with a vise grip and pull! On larger springs I weld a ring on to one end of the spring so that I can chain that end to my anvil stump. The spring is placed on a 2" diameter shaft which is chained to the forks of my tractor, which is then used to pull out the heated spring. All thats left to do is a little straightening of the spring on the anvil or under the power hammer.