StarTech.com ARMQUADPS User Manual page 16

You need to remove one of the Hand Screws from the
6.
Lower Base to use with the Grommet Base. Use a Phillips
Head Screwdriver (sold separately) to remove the Screw
from the Hand Screw on the Lower Base.
Removing a Hand Screw from the Lower Base
Slide the Grommet Clip over the Hand Screw.
7.
Sliding the Grommet Clip onto the Hand Screw
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