Build position locks for a normal PC chair.

Ratcheting, pneumatic , screw vice I dunno what would be most cost effective? Should be easy enough can even use door/shack hinges but the biggest issue will be I may have 2 feet of space or less to work with mabye twice as much horizontally.

Mmmmm I'm just not sure what would work... I doubt a gearnut some barrings and a bendy screw rod akin to what WW2 anti aircraft guns use.

I am unsure what your question is about.

Using the limited space under the chair to lock the position of the chair with a screw vice or something.