Is there a desk-mounted monitor arm/stand that specifically only goes up and down? I have a standing desk and every time I switch from sitting to standing position, I readjust my monitor height, but really dislike how free-floating arms can easily jerk the monitor off-axis. I want a sturdy arm/stand that is like a pole, clamped tight to the desk to minimize wobble, and allows a monitor to go up and down, and by a lot. Suggestions?