I don't remember what this piece of hardware is called, but it's easy to find at Lowes/Depot. I think they are used to join threaded rods (aka "all thread"). It is one inch in length, so it fits in the extrusion. This one, of course, is threaded all the way through at 3/8-16. Drill the hole a little small, and then file to the hex shape which keeps it from wobbling. On the other side, I used a 3/8-16 bolt and washer to lock this fixture in place.
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