In this schematic the "Bolt Flange 6x20" is used most often.
Check out any of the twenty-four Flap Valve (cr125r5,6) components enlisted.
A sample from the products for the Flap Valve (cr125r5,6) include: Bolt Flange 6x20, Pin,lock,4mm, Plate,valve Shaft, Washer,plain.