This is an easy project that involves turning down one end of aluminum stock on a lathe and drilling a hole on the opposite end. Adding a hole for a cotter pin is also generally a good idea.
Since I tend to be around TechShop quite a bit, I have access to a rather nice machine shop including lathes that can handle this pretty easily.
You will need:
Stock Aluminum (1.5" round stock in this case)
Drill (Hand power drill or drill press)
On an amusing note, you might be able to read that the thicker aluminum bar stock says Lightning Rod Lot on it. No, I do not know if that's what it actually is, but that just makes it all the more awesome.
Step 1: Turning the Male End
Use proper lathe techniques to turn the stock down to the size you need, in this case, a bit more than half an inch.
Note, the picture is wrong. I was actually using a facing motion to turn down the piece. Slap on the wrist for me.
Step 2: Drilling the Female End
See the nice chips? Not too hard of a process.
Step 3: Checking the Fitting and Adding a Cotter Pin Hole
Not too hard with a drill press, and only a little more difficult with a power drill. Line it up, drill and get it as close to the center line as you can.
Step 4: Testing!
Wear safety glasses, wear a heavy jacket of some sort. A hat would also be nice.
For some reason, the pictures won't rotate, but if you turn your head, they look pretty good. The part works, and it fits in the carrying case.