My headlights are flickering on and off, and I've traced the problem to a red wire that enters the back of the light/ignition switch. The problem is the whole area I'd wrapped in black electricians tape, so I can't really see anything. I've never removed this unit before, but there appears to be a circular clip around the read of the unit. If I loosen this, how does the whole thing come out-do I separate the rear unit from the black circular switch, and if so, how? It's all so old and fragile that I don't want to make it any worse than it is!