Unfortunately I don't have any pictures available to me right now, but I can paint you a lovely verbal picture:
The screw terminals have a hole drilled down through them to place a wire, and then the cap is screwed down to establish connection. Apparently my father thought his system wasn't working because of a bad connection and tightened it with a wrench until it sheared perpendicular to the plane of the hole. It's truly borked.
I'm in the greater Denver area.