How to wire up 1940 rubber CMP tail lights

[Lynn Eades]

Hi Guys, I am looking to wire in some old original black rubber CMP tail lights.
They have a nickel plated fitting (I'll call it a barrel) in the back that pushes in and turns, like most bulbs of the day. the nickel body has a small knurled nut that unscrews. This is where the wires enter the lights. There is an internal insulator with two tubes for the wires. I cannot see a way that it dis assembles.
My question is, How am I supposed to fix the wires into the small metal holes?
The end of the metal bits are also the contacts where the sprung loaded pins touch when the barrel is loaded into the main body of the light fitting.

Bob C. are you familiar with these old lights?

I haven't done any photos. I was hoping someone (cab 11 and 12 experts) knew what I am talking about.