On this parts fiche the Washer,oil Bolt is the most specified component.
The sub assemblies and components that make up this Rr. Brake Master Cylinder (cb1300/cb1300s) include this Sub Assy,rear M/c, the most expensive part.
The Pin,spring,2x10 is the lowest priced item on this Rr. Brake Master Cylinder (cb1300/cb1300s) schematic.