I want to put up a sort of lightweight temporary wall, supported by a
"temporary" stud pushing up into a (concrete slab) ceiling and down into
the carpet. So I'm trying to think of the best way to make it push up
on the ceiling and down on the floor--a sort of reverse turnbuckle.
Ideas so far:

--Mount small L-bracket into ceiling, cut stud a half-inch short of
ceiling. Use pry bar to push stud down into carpet while connecting
L-bracket to stud. Put male Velcro on bottom of stud so it will adhere
to carpet.

--Cut stud a quarter-inch short of the full height, then cut it at a
45-degree angle in the middle. Use radiator clamp or similar to make
the two angles slide past each other until stud presses against both
ceiling and carpet.

--Cut stud an eighth-inch short of the full height, then use door shims
(one from each side) to compress it between ceiling and carpet.

--Cut stud three inches short of full height, put a big lag screw in the
bottom end, and unscrew that until it presses down on a 4x4 block
resting on the carpet. Could use a hex bolt and nut rather than a lag
screw.

Comments on these, or altogether new ideas are welcomed.