Samson 3767 Mounting And Operating Instructions page 31

Mounting on control valves
Securing the aligned cam disk
To prevent the cam disk from turning, drill a
hole into the adapter (36) or coupling (44)
to allow a 2 mm dowel pin to be inserted.
Select one of the four holes located around
the center hole of the cam disk to secure the
cam disk in position.
EB 8355-2 EN 31