I used 2 threaded shorts of galvanized pipe from home depot.
The first one fits in the second. I also bought 2 flanges that I screw two piece of 2×2′ plywood. One act as a base and one serve as the table top . It rotate quite easily.
I don’t have the setup anymore as I left it in the backyard and the plywood delaminated. I kept the fittings and pipe for the next time I need the setup.
Abbas, Castro Valley, CA