The Bolt,hex.,6x28 is the lowest priced item on this E-15 Shift Drum - Shift Fork schematic.
Of all the components used in this assembly the Drum,gearshift is the most expensive.
With all the components that make up the XL500S 1981 (B) BELGIUM E-15 SHIFT DRUM - SHIFT FORK assembly. The 22x2thrust Washer is the most frequently specified with two applications.