PROGRESSIVE DESK DM-04-1 User Manual page 9

Assembly & Installation
Step 3: Position the VESA Mount
Step 3A: Slide the VESA Plate (A8) onto the VESA mount of the Arm (A5).
Step 3B: Rotate the VESA mount 90 degrees so that the connector is facing up as seen below.
Step 3C: Remove the VESA Plate (A8) from the Arm (A5) and set aside for Step 6.
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