The sub assemblies and components that make up this Gearshift Drum - Gearshift Arm include this Drum,gear Shift, the most expensive part.
In this schematic the "Roller,4x11.8" is used most often.
Parts such as the Gearshift Drum - Gearshift Arm: Fork,ct.5th Shift, B/brg Rad N/com, Pl,shift Drum Ctr, Pin, Shift Return are included in the Cb250n 1981 (b) England Gearshift Drum - Gearshift Arm parts fiche.