I used the sturdy cardboard tubes from the glow sticks we get at Michaels. They have nice plastic caps on the ends
I pushed in nails in a spiral pattern following the seam in the cardboard (see first picture as well). Next time I would use longer nails. Also, I would use a larger tube, this one is very small.
I hot glued the bottom cap into place and added dried black beans. Then I hot glued the other end on and put several layers of packing tape around the whole thing. I only let the kids play with this while closely supervised. I can't imagine them getting it open, but stranger things have happened.
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