Leveling mounts

My work bench is not in very good shape. It's out of level, it sags in areas because it's made of thin plywood. My Makerfarm didn't sit on my bench very well so I designed these mounts so I could use http://www.homedepot.com/p/Everbilt-1-1-2-in-Threaded-Stem-Furniture-Glides-with-Felt-Base-4-per-Pack-49909/203661114 from Home Depot to level my printer as well as make it a little quieter. I originally made the smaller ones, but was afraid they were to small so I made the larger ones. The hex poc