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Those nuts are self locking. There is a nylon ring at the top that keeps you from threading them all the way down by hand, but they'll thread down just fine with a wrench, and won't back off by themselves.
That brace is the exact same one that Vertex is selling, and I just installed on my car. Search for another thread about them, and you'll see my comments on its installation, which is a pain. There's an interference issue, both for how the bar gets mounted, and also when those nuts are tightened down. Did you get an instruction sheet of any kind?
I ended up putting a skinny washer between the nut and the Heim joint because when the nut is tightened, it contacts the outer part of the joint, which places downward force on the joint and the bar, which pretty much makes it impossible to adjust since it is now in a bind.
Poor design in my opinion. I called Vertex and expressed it.
Jack
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