Single bulb headlight question

[wrndln]

I am getting ready to try to assemble my single bulb headlights after getting them renickeled and hopefully all the parts I need. I am attaching some pictures of a small plug part that I believe goes into the end where the main wiring harness connects to the headlight inside harness. The first picture is of my original inside headlight harness and the other three pictures are of the plug I have questions about. This black plug appears to be the part that connects the inside harness to the main headlight harness coming from the steering column switch. I am not sure how the black socket part is supposed to be installed. As you can see in the pictures, one end has two flat brass contacts, the other end has holes with some brass contacts with small holes down inside the plug holes and there are two brass screws installed from the sides. I don't know what the brass screws are for - maybe to retain the contacts on the end with the small holes in it. Is the black plug supposed to be pushed into the inside headlight socket with the flat contacts going in first? After that, how do the two wires from the main harness connect to the plug? I haven't seen any diagrams of this part of the wiring. If you know where a good picture of this area can be found or can explain how these parts are installed, please let me know.
Rusty Nelson