Ducati Diavel Workshop Manual page 504

Final drive
Remove the chain with the tool code 88713.1344.
The tool is composed of a holder (A), punch (B), body (C) and two wrenches (D) and (E).
Fit the link to be opened into the holder (A).
Fit a punch (B) into the body (C) and manually unscrew the screw until the punch no longer protrudes.
Fit the holder (A) and link into the body (C).
Manually turn the screw (F) on body (C) so that the punch (B) locates against the pin, taking care that they are aligned
with each other.
Fit hex wrench (D) into the hexagonal part of the body (C) and wrench (E) onto the bolt.
Turn the bolt (F) clockwise to push out the pin.
Remove the chain.
Engage a low gear and unscrew the nut (12).
Remove the nut (12) and the safety washer (13) on the pinion.
Remove the engine pinion (14) from the gearbox secondary shaft.
Remove the spacer (15) with O-ring (16) from the gearbox secondary shaft.