Okay thanks. That's the way I did mine. I used the double nuts on my router but I do not consider that a precision machine. I'm a little suspect of the Chinese double nuts. When I installed mine two of the three you could tell had some preload, the third did not fell like it had any so I put that one on the Z. I'm not sure if they can be adjusted. The Chinese double nuts we use on the router at the high school have worked great for the last two years and that was built as a precision machine.