StarTech.com 3M1A3SG-MONITOR-ARM User Manual page 22

Using the 4mm Hex Key, loosen the Screws (x 4) on the
3.
back of the Lower Desk Clamp until there's 1/4 inch (6mm)
gap. Do not remove the Screws. (Figure 5)
Pass the Screws through the Screw Holes in the Top Desk
4.
Clamp. Choose the Top and Middle or Middle and Bottom
Screws Holes based on n the Thickness of the Desk. Slide
the Screws down into the smaller portion of the Screw
Holes. (Figure 6)
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0.25in /
Figure 5
Figure 6
9