Adjustable Foot Level

I live in an extremely old house, the byproduct of that are floors that incredibly warped and impossible to get an exact level on. My workbench was being supported on 3 legs by stacks of cardboard that slowly started to get on my nerves. So in seeking a level table, I designed this screw level and it solved all my problems. I found the easiest way to install these at the correct height (if you have something already propping the table up) is to use a pair of calipers to measure the depth between