eleven components are shown in this Gsx550eu 1986 (g) Germany (e22) Signal Generator exploded diagram.
Parts such as the Signal Generator: Clamp, Washer,lock, Screw(5x12), Clamp are included in the Gsx550eu 1986 (g) Germany (e22) Signal Generator parts fiche.
In this schematic the "Screw 6x12" is used most often.