The Shift Drum/shift Fork (1) assembly is constructed from several parts from which the Drum Gearshift is the most expensive.
Some items from this specific schematic: Pivot, Shift Drum, Spg,shifter Reset, Fork,ctr.gr/shift, Spindle Gearshift.
Of all the components that make up this Shift Drum/shift Fork (1) the Roller,3x8 has the lowest price.