"RB" wrote in message
...
I'm looking a simple, maybe 2' long retracted, 4' long extended, light
duty screw jack.

If anyone knows where I can find a gizmo like that, please let me know. I
want to put a swivel foot on each end and use it for a knee brace on a
fence post.

Make one from a piece of pipe and a length of threaded rod. Weld a nut on an
end of the pipe.