Vauxhall Astra Owner's Manual page 172

Fitting the coupling ball bar
Press fastenings inward and remove
cover.
Disengage and fold down the socket.
Remove the sealing plug from the
opening for the coupling ball bar and
stow it.
Checking the tensioning of the
coupling ball bar
■ Red marking on rotary knob must
point towards green marking on
coupling ball bar.
■ The gap between the rotary knob
and the coupling ball bar must be
approx. 6 mm.
■ The key must be in position c.
Driving and operating
Otherwise, the coupling ball bar must
be tensioned before being inserted:
■ Unlock coupling ball bar by turning
key to position c.
■ Pull out rotary knob and turn
clockwise as far as it will go.
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