I just put one of them to use.

the table has a hole to hold our "sink", and I made a disk to plug the hole when we don't want the sink there.

The leg comes off the receiver at a compound angle so that it fits into the table storage drawer. Here it is on the bottom of the plug in table. It attaches to the table with three wingnuts.

and finally, here's the table in the storage drawer.

the table is REAL solid. No wobble at all. We're heading out in the morning for the weekend to try it out.
Sam