exciter

So, for a long time now I've been bodging my starter motor, bending the small piece of metal the exciter cable slips on to, because the connection would always come lose. Today it finally gave up, and the metal prong bit has snapped off the starter motor. Can this be fixed with a weld or will...

If I go into the engine bay via the drivers side wheel arch I can see the starter motor, at the top of the starter motor is a wire, I believe this may be the exciter wire? Sometimes my car doesn't start, and if I wiggle this connection it will start again. I'm sick of doing this now, can this...