I clamp a piece of copper to the tang and drill one hole then put a slip fit pin in the hole and drill the second holle them mark the tang dimension on the copper, scribe in the curve back and cut it out roughly with the hacksaw followed by sanding the curve to shape and the front square to the top line. This is then clamped to another piece of copper and the process repeated and with them pinned together that can both be made identical and the copper rivets spun in the drill press and files to be a easy slip fit in the drilled holes.
