Ducati Monster 796 Workshop Manual page 636

Flywheel - alternator
Reassembly of the flywheel-alternator assembly
Install the starter clutch (21) in the flange (13) and take it fully home.
Important
Orient the flange with the round edge side (A) facing the starter clutch.
Seat the flange (13) with the starter clutch in the flywheel (16), aligning the flange locating hole (B) with the flywheel
locating hole (C).
Insert a pin or a wrench inside the hole (C) on the rotor flywheel in order to line up flywheel holes with flange threading.
This is a useful tip, as the holes cannot be aligned after having fitted the flange to the flywheel due to the interference fit.
Orient the flange with the round edge side facing the flywheel.