Shims allow for mobile devices of varying widths to fit tightly, but comfortably in the Swivl base. All kits come standard with three shims - small, medium, and large.
First, slide the grip out of the base by pushing firmly to the left.
The grip will already have one shim installed as shown above.
Next, remove the shim from the grip by pulling it outward. Replace it with the appropriate shim that best fits the width of your device with its usual case.
Replace the grip into the base by aligning the grooves on the grip with the grooves on the base. When it sits flat, slide the grip to the right to lock in place.