The Nut,hex,12mm is the lowest priced item on this Drive Face/ Kick Starter Spindle schematic.
Parts such as the Drive Face/ Kick Starter Spindle: Nut,hex,12mm, Bush,kick Spindle, Washer,special 12, Washer,14mm are included in the Nps50 Zoomer 2006 (6) England Mkh Drive Face/ Kick Starter Spindle parts fiche.