Now we need to figure out how to mount the center piece (that will soon be covered in foam and cloth) to the base. I’ve read elsewhere that tee nuts are the way to go. They allow you to recess the back of the screw to the table, and remove the center section for cleaning later on. You have to counter sink the back of the nut on the tope (foam) side of the center piece. And then drill holes trough the bottom base board. Here is the tee nut and counter sink hole.