I've got 2 pairs of very high quality booster cable battery clips and I'm fixing 2 gauge welding cables to them. WHat's the best way to crimp it? The only part in the climp to crimp the wires are the U shape copper piece near the 'teeth' of the clamps. I've used pliers to bend the U shape copper piece to fold down and press onto the exposed copper of the cable. There no where else on the clip where I can crimp the cables. Should I also solder the wires on now? Is there a possibility of copper oxidizing and the contact becoming bad after years?