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Instead of hammering them on and accepting that it will wear out over time, I would drill a 1 1/2 inch hole in the top or bottom that meets the end of the hole for the rod. Not all the way through, of course. Then use some washers and a nut and tighten it. Plug the top of the hole with a plywood circle and you have a clean and easy to disassemble solution.Plus, there's rods that have a regular wood thread on one end and a machine thread on the other, I'm not sure if I would trust screwing a machine thread into wood.