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In a case like this, I usually either totally remove or at least unbolt the upper steering jacket tube to allow it to drop down to get access to where the lock cylinder/steering lock enter the jacket tube. Then there are a few approaches. The "high and snooty" way ("more" proper way, although MB doesn't really spell out a proper way to do this with a seized lock cylinder) is to use a micro-torch or an acetylene torch with the smallest tip available, and heat up the locking pin to a bright red, and allow it to air cool, (do not quench with water, you are trying to remove the hardness), then drill or grind it down to allow removal. You will find the locking pin under the clamp that is bolted to the steering jacket where the steering lock enters, just unbolt and use a pair of pliers to remove the clamp, you should be able to reuse it no problem.
A "dirtier" method is to do the above (drop down or remove the upper steering jacket tube) and remove the clamp, and at that point use a small chisel or maybe even a "beater" screwdriver wedged between the steering jacket tube and steering lock to give enough clearance to allow the steering lock to be removed, by allowing the locking pin to slip under the locking hole. After removal you will need to reshape the side part on the jacket, as you want the locking pin to lock into the hole again, although the previously mentioned clamp will in fact hold the steering lock in place just fine.
Gilly
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