Made one some years ago - 3" dia x 8' pipe, some foam at each end, fixed cap and screw on cap, then pair of u bolts and big plastic handle nuts. Worked great.
Now I use one of the headrest mount interior rod holders...
The really bad part is the waste of $400 + bucks. Better to wad up a bunch of singles and duct tape...
Shoulda done my homework, I guess. Expensive lesson.
The clip bit kinda fits (faint praise there), but the molded shape is so far off that the "lever" can't begin to hold the edge against the body. 3M tape doesn't help that - doesn't allow the edge to fit properly.
Well, a number of us tried smoke signals and sacrificing some veggies, but that didn't seem to work...
(Or check the tracking thread. Works some of the time. Good luck! )