Weber

Most AFB's, NOT AVS

AFB, 4000, Marine, Shaft rotates clockwise to close choke (rich)
2 1/4" cap diameter

AFB Step Up Rod

Carter check ball brass weight.

Shaft rotates clockwise to close choke (rich)
2.00" cap diameter

Spring loaded

3/4" x 2.5"

Shaft rotates counter-clockwise to close choke (rich)
1.94" cap diameter, .82" cap depth

Shaft rotates clockwise to close choke (rich)
2" cap diameter