Pelican Mercedes-Benz Tech Article - Removing Your Front Door Lock - C230 / E320 / S320 / ML320 / CLK320 / SLK320
The procedure said to be applicable to W203, W210, W220, W208 and R170.

In figure 6, it suggests that the Window Regulator must be removed to give sufficient space to get the door lock out. To remove Window Regulator, we also need to detach the glass from the Window Regulator. Seems quite troublesome if we just want to take out the door lock...

Anyone has prior experience on the front door lock on any above chassis? Any tricks that we can take out the door lock without removal the window regulator?