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A friend of mine used an upturned scaffolding foot. The footplate screwed to the underside of the table, and the threaded shaft passing through the bottom table and the bench underneath, the wingnut bearing on a collar in the bottom table. He welded a wheel to the legs wingnut so it was really easy to unclamp the table, spin the wheel to get the required height and then clamp up again. Depends on course whether you would be willing to make the necessary hole in the bottom table if it doesn't have one already.Has the advantage that it only takes up the thickness of the nut and collar, couple of inches maybe. Of course you also need the space below to accommodate the screw.
A friend of mine used an upturned scaffolding foot. The footplate screwed to the underside of the table, and the threaded shaft passing through the bottom table and the bench underneath, the wingnut bearing on a collar in the bottom table. He welded a wheel to the legs wingnut so it was really easy to unclamp the table, spin the wheel to get the required height and then clamp up again. Depends on course whether you would be willing to make the necessary hole in the bottom table if it doesn't have one already.
Has the advantage that it only takes up the thickness of the nut and collar, couple of inches maybe. Of course you also need the space below to accommodate the screw.