One annoyance is the fact that double action truss rods are still being made with brass nuts. Why? If someone ruins the soft metal nut, then, basically, your whole guitar/bass neck is a total loss. This happened to me with a Peavey I had. Nut was well mangled when I got it. I didn't know it was a 2-way. Modern truss rod nuts need to be made from hard metal since they are non-replaceable.