In this schematic the "Bolt,flange,sh,6x25" is used most often.
Parts such as the E-7: Clamp, Nut,hex,12mm, Flywheel Comp, Washer,plain,12mm are included in the Nps50 Zoomer 2005 (5) Japan Af58-140 E-7 parts fiche.
The Nut,hex,12mm is the lowest priced item on this E-7 schematic.