New to the forum. Don't have much knife making experience but I am looking to redo my grandfather's four peice folder. I have some jewelry experience and actually broke down and re-made a cheap little two bladed folder for a class in college. So I am confident I have the skills, but I misplaced one of the spring's from my grandpop's knife. I will use the remaining spring as a template to cut a new one. I have only used a jewelry saw on soft metals, so I am guessing I need to step up to a coping saw!? I am wondering what kind of steel do I need to cut the replacement from? Do I need to harden the steel? I'm am sure with a little guidance from some of you fine folks I would be able to takle the project.