(The "table" is 2 pieces of slotted sheet goods that he can put on top of his workbench when needed)
One end of each caul has a piece of bungee cord permanently attached and the other end uses the ball (as shown below) to hold it upright while you tighten the clamps. The bungees are basically that extra pair of hands that we are often looking for.
The making of the cauls and table starts at about 9:00 here. The first 9:00 is basically fluff.