Alright I am going to try with pics!!!
Here is what I am going to call everything...
First you take the Metal bracket, and loosen the Wing nut, and bolt, like so...
Then you hold the Little opened end, over the Ball joint, BUR DON"T TIGHTEN THE WING NUT, AND BOLT YET!!...
While holding the Little opened end, over the Ball joint, slide the Big opened end over the Base of the lamp, and TIGHTEN THE WING NUT, AND BOLT...

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RES's
Tank, SCL 3.75in.
Diesel, SCL 3in.