I am going to add twist. When I though I had a Lock Tumbler problem it turned out the innards of the Steering Colum Lock were broke in 2 Places.
You can purchase the whole Steering Colum Lock Assembly and it comes with a New Ignition Switch and Vacuum Shutoff Valve.

The one I bought was from the Mercedes Dealer and it had Made in France on the Box and cast into the Steering Colum Lock housing was Neiman.

Neiman/Valeo Made in France Steering Colum Locks sell for about $20 less than the the one I got from the Dealer about 3 Years ago.

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84 300D, 82 Volvo 244Gl Diesel