The past year my Aeron chair has been bothering me because the armrest will not stay in position. I search all over the web for a solution but it seems that Aeron has switched to a new system and mine is not really supported anymore. I have a knob that you turn to lock and unlock the armrest height. The newer models have a lever that you flip, similar to the quick release on the wheel of bikes.
I finally figured I had nothing to lose so I decide to take apart my Aeron to see if I could fix it myself. As it turn out, it was a super easy fix. The securing mechanism for the arms just needed to be tightened! Why didn’t anyone mention this on all the websites I explored? Here’s a quick and easy step by step.
First, remove the back of the Aeron chair. There are 4 screws securing the backrest and they are easy enough to remove using an allen wrench. Here’s what my chair looked like after the screws were gone and the backrest lifted off.
If you look at the arm rest risers, the part that was covered by the backrest reveals a screw used to tighten the assembly. The reason the arm rests won’t stay up is because the assembly has gotten loose. All you have to do is tighten the assembly with the thumbwheel. You’ll notice that even with the thumbwheel tight, there is still some play by the metal plates secured by the hex screw. Use a wrench to tighten this bolt until it is snug. Don’t go crazy or you’ll not be able to operate the thumbwheel afterwards! Here’s a photo of the screw to tighten.
Well, that’s all there is to it! After you’ve tightened the screw, just put the backrest back on (4 screws) and enjoy your chair with arm rests that actually stay at the height you put it.
I can’t believe how easy it was and how hard it was to find any useful information on the web! I hope this little post will help someone who has similar issues with their older Aeron chair.