Here is a quick tip for using Tee nuts when bolting wood things (like layout legs) together. At first, I drilled the hole and hammered the Tee nut into place, but I found that I didn’t necessarily get the nut lined up right so the bolt would go through.
A better idea… run the bolt through the hole, and thread the tee nut onto the end. Then, while holding the Tee nut steady against the wood, drive the bolt home with a power screwdriver. The bolt will pull the Tee nut into the wood, and it will be precisely aligned!