There is a tool Angenieux made for adjusting their spring loaded "C" mounts on their zooms. It's called a "T" wrench. Any rental house or repair shop has a bunch of them laying around. Should be free or at the most a few bucks.
Actually not so odd. These barrel mount (no focusing threads) lenses are very similar to the Zeiss Luminars which were also designed to be used with bellows or extension tubes.
Go to the site listed below and look under "Newbies" or "operating and type in video. Lots of info there.
http://www.steadicamforum.com/forums/index.php?