What I needed was something stable with small footprint that I could slide between two seats and not take up any space in an aisle. I spied a microphone stand on stage, which was just what I needed. The remaining obstacle was to figure out how to mount a camera to a microphone stand.
Cameras come with a 1/4"-20 hole in the bottom to affix a tripod or a shoe. Microphone stands use a 5/8"-27 thread for mounting clips and goosenecks. Hmm. 1/4"-20 is common... but 5/8"-27 isn't and I figured I wouldn't find "just the right thing" so I set off to the hardware store.
Step 1: The Pieces
After wandering through the local hardware store, I came up with the following list of pieces to fashion my camera mount.
A non-threaded female-to-male threaded adapter for 1/2" PVC
A threaded PVC cap that fit on the previously procured adapter
One each 1/4"-20 nut, wingnut and 1-1/2" long bolt
The minimum purchase (12" in this store) of 5/8" ID flexible water hose.
I probably could have done this with just the non-threaded version of the PVC cap, but I figured that building it this way would give me a way to interchange caps that might have new and different purposes in the future.