Mercedes-Benz pmn Operator's Manual page 334

Practical hints
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Operational position
Turn crank handle clockwise until it
engages (operational position).
Before storing the vehicle jack in its
compartment:
It should be fully collapsed.
The handle must be folded in (storage
position).
332
Setting up the collapsible wheel chock
The collapsible wheel chock serves to
additionally secure the vehicle, e.g. while
changing the wheel.
1 Tilt the plate upward
2 Fold the lower plate outward
3 Insert the plate
Tilt both plates upward 1.
Fold the lower plate outward 2.
Guide the tabs of the lower plate all the
way into the openings of the base
plate 3.