Alright, here goes, as promised, my attempt at a DYI.
Removing the key tumbler and the ignition switch from my 1995 S320.
I found that (in hind site) I didn't really need to remove the instrument cluster. Eveything can be accessed from under the dash. I used this thread:http://www.benzworld.org/forums/w140...tion-lock.html
which was helpful.
The first thing you should do is remove the lower dash cover so you can access the ignition assembly from under the dash. You have to remove a few screws from under the dash and by the "disengage e-brake" handle to remove the lower dash cover. The lower dash cover won't fall. There are two spring loaded retaining hooks that keep the lower dash in place.
I was told to run a magnet over those two areas and that would disengage the hooks. I just squeezed a small screw driver in there and they disengaged.
Next, I removed the plastic ring that surrounds the ignition on the dash. It does not pry off you actually have to unscrew it. The front part of the ring screws into the back part behind the dash sandwiching the tumbler cover in place. I unscrewed it from the front and the front ring came off just fine.
I got into contortionist mode and went under the dash to remove the ignition assembly. You have to unscrew the ignition lock cable (I forgot what size open wrench I used) that is attacthed to the side of the ignition assembly. It unscrews easily. Then I had to depress two spring loaded locks on each side of the rear of the plastic ignition switch cover. This is demonstrated here:
I pulled the ignition assembly down from the dash and then unplugged the assembly.
Now the fun part, removing the tumbler.
Pic off separated components of ignition assembly
First I had to remove the damn metal tumbler cover. Some people actually had to cut the cover (which seems Mercedes made certain of that). I did not want to cut the cover so in frustration I just kept twisting and pulling on the cover and after a while it came off.
This ring is responsible for keeping the tumbler cover in place.
I then removed the iginition switch. First I put a key into the tumbler and turned it to position 1. Then I pushed on the button at the rear of the switch and it slid out of the plastic cover.
This pic shows the button to push to remove ignition switch from cover.
Lastly, removing the tumbler.
Tumbler in "off" position
Tumbler with key in "position 1" (notice how the key lines up with hole at the side of the tumbler. This is where you use a small screw driver).
Tumbler with key in position 1 and screw driver inserted in hole to depress spring locking mechanism to remove tumbler.
Tumbler removed showing spring locking mechanism
Remove key. Done.
shot of assembly taken apart... again
I hope this helps!