Ducati Diavel Workshop Manual page 736

Clutch assembly: clutch
Install the clutch plates (9) in the following order:
on the drum (12):
- a series of ten driving discs (L) alternately to new driven discs (I) thickness 2 mm;
on the pressure plate (4):
- one driven disc (H), 2 mm thick;
- a driving disc (L).
Insert the control pin (14) in the bearing (5) and the latter in the gearbox primary shaft.