Ducati Diavel Workshop Manual page 712

Cylinder head assemblies: valves - rocker arms
Repeat the procedure with the opposite valve and check that the top of the valve stem is aligned with the surface of the
shim (7); if it is not, repeat the half ring installation procedure.
Install the closing shims on the intake valves (14) using the method described above for the exhaust valves.
Refit the timing shafts (Sect. 9 - 4.4, Refitting the camshafts) to check the valve clearance when closed (Sect. 9 - 4.1,
Checking and adjusting the valve clearances).
Refitting the opening shims and opening rocker arms
Using an M6 screw, position the opening rocker arm shaft (2) (diameter 9 mm).