Ducati Superbike 848evo Corse Owner's Manual page 98

Once preload has been set as required, tighten the
upper ring nut.
Warning
Use a specific pin wrench to turn the preload
adjusting nut. Be careful when turning the nut with
the wrench, as the pin may slip out of the ring nut
recess and you may hurt your hand hitting
motorcycle parts.
Warning
The shock absorber is filled with gas under
pressure and may cause severe damage if taken
apart by someone who is unskilled.
If you intend to transport a passenger and baggage,
preload the shock absorber spring to the maximum to
improve the dynamic performance of the motorcycle
and to avoid possible interference with ground. You
may find that rebound damping needs adjusting as
well.
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