The component with the lowest price in the E-4 schematic is the Bolt,hex 6x16.
This E-4 diagram displays the required parts for the Mt50s 1981 (b) Belgium E-4.
Parts such as the E-4: Spring,ratchet, Bolt,hex 6x16, Gear,oil Pump, Washer,15mm are included in the Mt50s 1981 (b) Belgium E-4 parts fiche.