Just did mine a few weeks ago.

You'll need to turn your key to the #1 position otherwise you're in for a long painful (or $$$$$) job.

1. Turn you key to the #1 position
2. Place a small wire into the holes
3. Pull ignition out
4. Reverse for installation of new tumbler (approx $100-150)

It's that simple if you can get it into the #1 postion. It'll take you about 15 minutes. Do a search as suggested by "MB STARS". I know there are some post with pics to guide you through this process.

If you can't turn the key to the #1 positon then you'll have to drill it out. If you take it to the dealers that will cost you approx $400-600.

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JR
1986 Gold 300E 4Dr automatic