I used to work where the main computer console table was as you
describe, except they used a link chain and a removable handle. The
chain wrapped around sprockets on 4 jack screws within the table top
and raised and lowered the top about 18". It was a fairly substantial
table, the computer monitors were pretty heavy as was the card reader
and other gear. The rear jack screws had square ends recessed on top,
the crank fit either one. It was set up with such substantial movement
so the operators could either work standing or in an office chair.
Management didn't allow lounging around so they were run to the top and
the crank handles kept elsewhere.

Stan