30in long aluminum tube with a 3/4in diameter from the hardware store. 3/4in washers that matched the outside diameter of the tube without being able to fall inside. I filled the ends of the tube with some two part epoxy and taped the washer over the end making a plug about 3/4-1/2 inch thick. Once the epoxy had set I drilled a hole through the end and glued a nail in each end. Electrical tape to make sure the washers don't come unglued and get lost.
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