a long dowel on each corner of the table top that extends into a bore through each leg (many ways to create the thru bore), and a lifting cam on each corner with a 12" or so handle to provide leverage. Activate the two handles on one end and latch in place then repeat on the other end. The lift can be whatever dimension you cut the cam lobe to.
Ed
director of post graduate studies at the rube goldberg institute of remedial dentistry and iron mongering.
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