The most reasonably priced component used on the Cm400t 1981 (b) Usa Clutch Cm400c/t 79-81 is the Bolt,hex.,6x25.
This schematic depicts all components used in the Cm400t 1981 (b) Usa Clutch Cm400c/t 79-81 partslist.
In this schematic the "Disk A,clutch Fri (nas)" is used most often.