Picked up a 2018 gently used Unity Corner Bed. On our sixth night, and the U Lounge table seemed wobbly so I loosened the base clamp and it rose up exposing two tubes. I've loosened the set screws at the base that holds the lower clamp on. But I cannot reinsert the table leg far enough into the center base to secure it, it is essentially sprung. Ideas please? I'm sure...