Ducati Monster 796 Workshop Manual page 387

Rear shock absorber assembly
Slacken off lock nut (A) and spring adjuster nut (B) with a pin wrench or special tool, and remove the spring.
Visually inspect the shock absorber for oil leaks and other problems.
Renew the shock absorber if necessary.
Reassembly of the rear shock absorber
Fit the spring into its seat in the shock absorber with the tapered end towards the lower mounting.
Screw in the spring adjuster nut (B) to obtain the previously measured length (L).
Note
One full turn of the adjuster nut changes the length of the spring by 1.5 mm.
Tighten down the lock nut (A) against the adjuster (B).
Lubricate the thread and underside of the head of the screw (2) and the contact face of the nut (4) with the specific
grease.