Allan Wrench - How to Adjust the Elx Arm

We knew that we would need to do some adjustments to balance the display on the arm. We looked at both metric and imperial sizes, and could not find the right tool. You don't use an allan wrench to just tighten the joint by going perpendicular to the arm. If you flex the joints properly, you'll see a hek head screw that does fit the included allan wrench. I can see the top of my display at eye level for the first time in a year.