A simple wrench I slapped together to loosen the screw lens(allowing to change focus distance) without damaging the plastic.
Use some pliers to hold the camera unit steady so that it doesn't come off the base.
UPDATE: I now finally added a version for V2 of the Camera (with 4 notches). Untested as I don't have one of those, but should work fine.
UPDATE2: For all you camera collectors out there now also a version which can screw both revisions of the camera.