Step 9: One last variation, maybe the best...
After I thought I was done with this one, by creating the octagon, I found this at my local hardware store in the plumbing section. $5.25. A drainage pipe, with accordion like sides. I bought the length about ten feet, filled it with beans, and attached it to itself. It held perfectly, it was the perfect size, no need for screws because of the ridges.
However, this version needs rice or some smaller noise making device. Beans and beads are too big.
And there you go.