This is interesting. Last time I looked into pulling the wheel on my 124 the problem was the airbag was secured using tamper resistant torx screws. The tamper resistant head isn't fully open, it has a metal dome cast into it. This dome prevents a standard torx head driver from being inserted - you need a driver which is hollow in the middle to fit over the dome.
I've got a full set of torx head screwdrivers, but they were useless in this application. I can easily get access to the screws, but cannot turn them. Doesn't anybody else run into this problem? Does the MB tool work on the tamper resistant heads?