Parts such as the E-4 Camchain - Tensioner: Bolt,pivot, Cap,tensioner Adt, Set Bar,tensioner, Chain,cam are included in the Ct125 1983 (d) Australia E-4 Camchain - Tensioner parts fiche.
The Bolt,hex 6x10 is the lowest priced item on this E-4 Camchain - Tensioner schematic.
With three applications this Bolt,hex 6x10 is the most specified part.