Original Herman Miller Aeron Classic Size B Base Cylinder – Works, Caster Replacement Wheels. Year of the Aeron is 2001. Up & Down lever works & Cylinder works, and was tested. Bottom of the plastic case has an enlarged hole cracked, where the screw goes. The Bottoms of the Casters have been touched up with spray paint hole where the screw goes. The Tips of the Casters have been touched up with spray paint.