Regarding my wife's 1995 C180, I suspect that the steering column spiral canester is faulty (Horn and airbag faulty) , and I need to remove the steering wheel.
After removing the airbag, the steering wheel seems to be attached by a nut which is removed by a large allen key. I can't loosen it even using a good quality
allen key socket with a long extension handle. I assume that you can't use the ignition steering wheel lock to stop wheel rotation when loosening the nut, as it will break with the force.
I don't have a workshop manual for the C180, and I want to check that I am on the right track, and haven't left anything out. Could someone please advise.

 

just unlock the steering wheel and turn it to left stop, and have one person assist to lessen the force.