Arm Bolt Assembly for Aeron Chair Replacement arm bolt for the Herman Miller Aeron chair for height adjustable arms that have broken off Our Aeron arm bolt height adjustment kit only works for Aeron chairs that have the thumb-wheel style height adjustment Our Aeron arm screw assembly includes all pieces for the assembly. One Aeron arm stack assembly kit per arm This Aeron arm rest stack-up kit is a genuine Herman Miller part This Aeron arm kit will not work for the fixed Aeron arms or the height adjustable Aeron arms that use a lever