The component with the lowest price in the GEARSHIFT DRUM schematic is the Circlip,ex,14.
On this parts fiche the Bolt-washer,6x12 is the most specified component.
Parts such as the Gearshift Drum: Bearing Ball 6500, Drum Comp,gear Sh, Fork R,gear Shift, Bolt-washer,6x12 are included in the Cb600fa Hornet 2011 (b) France / Abs Gearshift Drum parts fiche.