Rovert

I have made a legvice spring out of leaf spring. Shape it to the required shape, then heat spring to critical temperature (ie loses magnetism) and cool in wood ashes (to anneal and remove stresses). Leave for 3 or 4 hours then reheat spring above critical temperature (ie loses magetism: cherry red) then quench in oil - keep moving around. Remove spring from oil while still hot (approx 300 - 400 degrees C), then heat spring till hickory stick glides over surface smoothly. When this temperature is reached remove spring from forge and let cool in ashes or air. This is a workshop method of heat treating springs. Hope this helps, good luck Trevor