Of all the components that make up this Gear Change Drum & Forks the Screw-cntsnk Hd,6x20 has the lowest price.
Some items from this specific schematic: Pin,dowel,8x18, Holder,change Drum Pi, Drum-assy-change, Circlip-type-c,30mm.
Of all the components used in this assembly the Drum-assy-change is the most expensive.