I guess that I must have had the heaviest duty of any of the leveling feet that I see on this thread. I cut hex mortises into the 4x4 legs of my bench, to recess the nut from a 1 1/4" bolt. The nuts were then epoxied into the mortises, and now when I wheel the bench out onto the driveway, I can make it rock solid with a crescent wrench.

Sorry I don't have any photos.

Doc