>"You wouldn't attach the wheels to the barrel like the rods, you would instead have a rod-sized hole in the middle of the wheel and slip it over. Like this:"
>Make a circle with our thumb and index finger on one hand, then stick the index finger of our other hand inside it, then rotate the "circle" back and forth around the finger as much as our wrists would allow to demonstrate.
>"That way it can spin around the rod without the rod, and everything else, spinning. Get it?"