RB wrote:
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.

1. go to hardware store
2. buy piece of all-thread, and a 'rod joiner' sized to fit it. there's
the jack you describe. alternately, use a turnbuckle as an 'expander'
I
want to put a swivel foot on each end and use it for a knee brace on a fence
post.