Opel Automobile Owner's Manual page 158

158 Driving and operating
Fitting the coupling ball bar
Fold down the socket. Remove the
sealing plug from the hole for the
coupling ball bar and stow it in the
load compartment.
Checking the tensioning of the
coupling ball bar
■ Red marking on rotary knob must
point towards white marking on
coupling ball bar.
■ The gap between the rotary knob
and the coupling ball bar must be
approx. 4 millimetres.
■ Key must be at position c (1).
Otherwise, the coupling ball bar must
be tensioned before being inserted:
■ Unlock coupling ball bar by turning
key to position c (1)
■ Pull out rotary knob and turn
clockwise as far as it will go.
Inserting the coupling ball bar