I would like to know? just how this socket[end of wiring harness backend] How does this square plastic plug come out? Then do i just push the trailer, socket back into the bumper hole? What holds this socket into the square hole? Fraid i'm not to good explaining what i mean.Iwant the trailer socket, with the finned cap, in the bumper instead of the square spare tire lock piece. does anyone get my idea?? Or am i trying something that isn't meant to work this way.