Upgrading Herman Miller Aeron from Thumb Wheel to Flip Knob Arm Adjust

Upgrading Herman Miller Aeron from Thumb Wheel to Flip Knob Arm Adjustment

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How To Upgrade Aeron Arm Height Adjustment From Thumb Wheel to Flip Knob?

Upgrade your Herman Miller Aeron chair with our quick and easy guide. Transform the arm height adjustment mechanism from the outdated thumb wheel to the new, user-friendly flip knob edition. This tutorial provides all the necessary steps and tools you'll need to make the switch, enhancing your chair's functionality and your comfort.

Tools Needed:

Steps for Upgrade:

1) Remove the Chair's Back:

  • Start by using a 5mm hex key or hex head attachment to unbolt the four bolts located on the backside of the chair.
  • Carefully remove the chair's back and set it aside.

2) Prepare the Flip Knobs:

  • Ensure you have two flip knobs, labeled 'L' for left and 'R' for right, to replace both sides.
  • For this tutorial, we will demonstrate the process on the left arm. The same steps apply to the right arm.

3) Remove Old Thumb Wheel:

  • Unbolt the old thumb wheel while applying pressure to prevent it from spinning. This will help in detaching it easily.
  • Discard the old thumb wheel as it is no longer needed.

4) Install the New Flip Knob:

  • Take the new flip knob and insert the bolt, nut, and washer into it. Note the unique shape of the nut that fits only in a specific orientation.
  • Support the nut from the back with your finger and use the plastic part to rotate and align the nut.
  • Slide the flip knob into the swing arm and connect the plastic part until you hear a click, ensuring it's properly aligned and fitted.

5) Connect the Arm Swing to the Arm Yoke:

  • Use the provided bolt to connect the arm swing to the arm yoke.
  • Tighten the bolt gently to allow for easy adjustment of the flip knob without making it too tight.


By following these steps, you've successfully upgraded from an old thumb wheel to a new flip knob for arm height adjustment, enhancing the functionality and ease of use of your Aeron chair.

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