I know this thread was covered some two years ago. But recently I have had a need to pull several 190 door locks without having a key to do so properly. It is best to recover good door locks from a junk yard as the donor car's latch will be destroyed. I can only afford 10 minutes maximum per lock because of my workload. Trying to unbolt those Loktite latch screws is not a favorable way for me to go.
It has come to my attention the door lock stems break more often than not. Many people have asked me for a way to fix a broken lock. For those who still want to operate all locks with their master key and do not want to go to the expense of replacing the lock cylinder of one broken door lock, I have looked into recovering good unbroken door locks for their parts.
This way I can help the 'do it yourself' types repair their door locks and still keep their original lock.
Removing the door panel is still necessary. Then look into the space inside the door and near the latch for the base of the lock stem. The stem will be harnessed by a cream color plastic ring inside a metal bracket. Using a large flat head screw driver, break out the plastic ring taking care not to snap the base of the door lock stem off. Now remove the Allen screw securing the lock in place on the door jamb. The door lock, then can be removed from the 190 simply by lifting it out of the door.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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