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Loosen the screw to expand the anchor.
Slide the anchor over either hook on the back of the seat.
Tighten the screw to clamp the anchor onto the hook and secure it in place.
Install your favorite mounts, arms, or other accessories as directed by their instructions. For the 17mm mount pictured, loosen the collar, press it onto the ball mount, and tighten the collar while holding the mount in the desired direction.