Of all the components that make up this Camshaft / Valve the Washer,plane 8m/m has the lowest price.
A sample from the products for the Camshaft / Valve include: Cam Shaft, Spacer Cam 0.2m, Washer,plane 8m/m, O Ring 7.7x2.3.
In this schematic the "Cotter Valve" is used most often.