I found some old files and thought they night make decent knives. Should I forge them into shape or just cut and grind them into shape? I actually have done black smiting but it was over 20 years ago. Grinding then down isn't much of a problem since I could plasma cut out the rough shape and grind to finish with my large and medium size grinders and flap wheel. Or forge them into shape but the. That ruins the factory heat treating and temper. I could reheat treat and temper them if I knew the temperatures for high carbon file steel.