The lowest price component in this Front Master Cylinder (an400 L1 E3) parts-list fiche is the Screw.
Parts such as the Front Master Cylinder (an400 L1 E3): Cap, Piston/cup Set, Plate,diaphragm, Diaphragm are included in the An400a Burgman 2011 (l1) Usa (e03) Front Master Cylinder (an400 L1 E3) parts fiche.
On this parts fiche the Screw is the most specified component.