This is the bo I made out of 5' of 1/2" metal electrical conduit. It is fairly heavy, but light enough to wield. I hammered a sanded down synthetic cork into one end to act as a stopper and taped it in. On the other end, I put a metal end cap from a paper towel holder. For the grip, I wrapped duct tape at the 1/2 way mark. Over all it is pretty good. One downside is that it is pipe and can bend with an extremly hard blow. Solid steel rod would be better but would also be heavier. Ah well...
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