I really liked the original model, but my 24" monitor was too front-heavy for it to work. I keep my monitor on top of the computer, to the right of my X1C, and I wanted to set the monitor in portrait mode. My computer case has a mount for a 140mm fan on top, with the base of this mount being 140mm wide, and the holes aligning perfectly with the fan's mounting holes. I simply bolted the base to the computer case and slid the mount's arm into it. I didn't use mounting screws for the arm itself, as I occasionally remove the monitor to clean around my printer and computer.

Edit: I will mention the tolerance between the Arm and Mount hole are very close, any amount of brim left on the arm will make install difficult. Be sure to trim off any remaining fragments and you will be good to go.