Manfrotto 222 disassembly and ball cleaning instructions: http://bogentripodparts.com/JOYSTICKHEAD%20ASSEMBLY.htm
Very useful, but what a horribly built site! All of the graphics are "2,816px × 2,112px (scaled to 350px × 260px)" and not even linked to high-res! But again, very helpful. It made me see that my loose QR is most likely due to using the wrong plate rather than having a worn QR lever. I'll check my local shop and see if they have a proper one, and if not I'll order from these guys.