Uh its my neighbor's car..and not a Mercedes, but the post "counts" since I was working on my Mercedes when I was approached by my neighbor, who is on a tight budget and depends on this car for transportation and she won't let me return to reinstalling my transmission until I get this done..the lady broke her key in the ignition lock. However if I place the remaining portion of he Key in the lock, I can start the car, etc.

The car is a 1988 Corolla..

Is there a procedure or hope of extracting the broken part of the Key?

I broke my Ignition Key in the lock..