Of all the components that make up this Kurbelwelle & Kolben the Nut(2rh) has the lowest price.
On this parts fiche the Spring, Compression (5y1) is the most specified component.
Some items from this specific schematic: Pin, Crank 1, Bearing, Cylindrical (5h0), Washer, Plate(4gy), Spring, Compression (5h0).