Ducati Diavel Workshop Manual page 737

Clutch assembly: clutch
Place the pusher plate (4) with the two discs on the centring tool part no. 88713.3352.
Fit the pressure plate (4).
Insert a spring (3) in each slot.
Position the O-ring (2).
Lubricate the thread of the screws (1) with oil.
Insert the screws (1).