It has been bugging me for some time that my dining table was not level. Not sure how it got this way, but I seem to remember that the screws holding the frame to the floor were missing at some point and I replaced them. In any case, it bothered me enough that I finally did something about it. I found that the metal table frame was not plumb; while the screws were missing, it had pushed in the bottom of the cabinet it is attached to because there is not enough support behind it; the end of the table needed to be raised over an inch to make it level.
I removed the two screws attaching the frame to the floor, lifted it with a jack (pulled the cabinet out) until the table was level, reinstalled the screws and put in a couple more.
I removed the two screws attaching the frame to the floor, lifted it with a jack (pulled the cabinet out) until the table was level, reinstalled the screws and put in a couple more.

