Dual-threaded rod. Probably not the most practical fastener, and conveniently featured here between both a business and religious advertisement.
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Previously:
https://www.homemadetools.net/forum/...984#post149050
https://www.homemadetools.net/forum/...807#post137019
https://www.homemadetools.net/forum/...867#post152552
https://www.homemadetools.net/forum/...161#post141528
https://www.homemadetools.net/forum/...718#post139938