Your comment about using that hex key makes a good point PB. As I'm well known around here as being a man who "knows about cars" - a debatable point I'd suggest! - I've been asked more than once, to help loosen wheel nuts/bolts which have been tightened to such an extant that the wheel brace that comes with the car can't apply enough leverage to slacken them. They are invariably impressed when I deploy my 2ft long power bar and witness the loud "crack" as the nut/bolt is forced to surrender.
Sorry, I meant to finish this off by saying that having slackened these nuts/bolts I'm often asked how tight they should then be done up to once the wheel has been refitted. Assuming a torque wrench is not available, you won't be too far off the mark if you use the wrench supplied with the vehicle and do the fixings up as tight as you can just using your hands and arms - ie. not by jumping on it! much the same thinking as that behind what PB was saying about the Allen key he bought to do his old Panda. I suspect the car manufacturers make these wrenches so you can't apply enough force to shear or strip threads? Having done that, if you're unsure as to whether they are tight enough, you could always call at your local garage and ask them to check them. Which is probably advisable if you don't have much experience of this sort of thing.
