Last, you need to add a divider between the heaven beads and earth beads. This is called the beam.
I've used a thicker wire for the divider, string it through the holes in the shorter sides, and go UNDER the wires with the beads on them.
Then poke the wire through the opposite hole, and tie it off on each side inside the box.
The beam wire should be taut and touching the column wires, which will prevent the heaven beads from sliding down into the earth bead area.