This is a good idea. I did something along those lines when I was building racks, lots and lots of racks...When working with threaded rod, don't use your Channellocks to drive it into the coupling or anchor.
Take two nuts and, using two wrenches, jam them together at the end of the rod. Use a box-end wrench or socket to drive it in like a really long bolt. When it's tight, just use an open-end wrench to drive the second nut further down the rod, freeing the first nut.
I've gotten funny looks from journeymen when doing this, but I like it because I get to stay in one spot when making racks, and I don't have to mess up any part of the thread with my Channellocks.
If you're using 3/8 rod, ask the tin-knockers for a couple of their large nuts.
I took a rod coupler and a 5" piece of all thread. Screw the all thread about 1/2 way into the all thread and drill into the side of the coupler right through the all thread. Add a spring pin or cotter pin and you're set. Throw it on a drill and go to town.
I had 3 of these made up for different sizes of all thread.
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