Made a firing pin for a double action revolver once by cutting the butt off of a drill bit('cause it was hardened).
Then chucked it into an air drill, clamped the drill in a vice, turned the drill on, and held a file against the drill bit stub until it was the right size and shape. Then cut it to the right length. Works like an original.
Actually, it's a collectible revolver that I'll probably never use, but I still wanted it functional.