Ducati Panigale V4 R Owner's Manual page 275

To change the shock absorber distance, loosen the
ring nut (5) with the hexagon head wrench of 24mm
(0.94 in) and then work on nut (6) with hexagon head
wrench of 24 mm (0.94 in) to increase or decrease the
shock absorber distance. After reaching the desired
distance, bring the lock nut (5) against the nut (6)
while counter-holding nut (6) to avoid moving the
reached adjustment.
Attention
The shock absorber has a maximum distance
indicated by a groove on the threaded section of its
eyelet.
When reaching the maximum distance, the groove is
aligned with the lock nut (5) when tightened
If with tightened lock nut (5), the groove is not
aligned with the lock nut, this indicates the use of a
wrong distance (too long,
The shock absorber contains a safety pin to avoid
reaching too long distances: if you try reaching not
allowed distances, the pin could damage
irremediably the shock absorber thread: if during the
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5 6
Fig 224