Motostar MP100 Manuel D'installation page 15

Fastening the arms
Assemble the drive arm to the driven-arm
Fit the plug into the socket on the gearmotor drive-shaft.
Fit the drive arm to the gearmotor shaft and fasten it with the bolt, the washer and the O-ring.
PIN
UNI 6593 6x18
UNI 5739 M6x10
UNI 5739 10x14
WASHER Ø39X10.5
O-RING
Ø10x45