You can get some leg levelers at Home Depot or Lowes or Ace hardware.
Someone recently found some at (I think) Ace that fit his right out of the box.
For my Missile Command cocktail, I couldn't find any that fit at a store. I worked out (using an old tap set) that the originals were a #12 screw (which is pretty unusual for anything these days), so I tapped the holes out to 1/4, which was the size of the levelers I found at Lowes.
Good luck!