What I did/or found... When I removed the plastic panhead camera mount, I found the camera mount was attached to a solid round aluminum pillar mount base. I drilled (with a power dirll) and threaded a 1/4" female hole (set of hand taps) in the base an inserted a 1/4' all-thread. Then I screwed on one of Rick Grahams 1/4' nylon flag pivot mounts. This took me about 10min per stand to do after I determined what I was going to do. I didn't need a $15,000 lathe to drill and tap a hole....
I have saved the panhead camera mounts for the future. All I would have to do is unscrew the 1/4" all thread and slip the mount back on, tighten down the set screw and I would have camera stand again. I got the camera tripod from B&H Camera for $25.10 each plus freight ( invoice attached).
I determined pulling the aluminum base out would possibly cause damage to the stand and render it unusable.