I only mentioned that because I was in a tire shop, getting a punctured tire fixed, that also did general car repairs. In the bay next to where they were fixing my tire, a mechanic was doing a tuneup on a truck and I saw him with what I would describe as a ratchet driver driven by a air hose -- i.e., not a big pneumatic lug nut driver, but much smaller, only a little bigger than a ratchet handle, but it spun the socket and extension. He was using it to install spark plugs -- I don't know how much torque that gadget generated, but I noticed that he barely turned the plugs to thread them before he put his tool on them! The thought of possibly cross-threading them, let alone overtorquing them, made me shudder (and I made a mental note to *never* bring my car to them for repairs :-).

By the way, they do a wonderful job on my tires (I watch them every step of the way, including the Hunter "road force" balancing) that I buy from TireRack, or when I need to get a repair -- but I also bring them loose wheels/tires, never letting them touch my lug nuts (which I do at home with my torque wrench).