They're all a pain in the arse! I've tried the figure of 8, Luchs ball mount, and 2 different adjustable mounts. All of them require careful cossetting otherwise they can lose adjustment slightly, needing a tweak to centre the beam. Sadly it's all we've got at the moment so I put up with and live in hope for something that isn't over engineered and has screws that aren't made out of plastic metal.