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Remove the Side Plate Screw
Remove Side Plate Setscrew on a Gangable Box
In order to join two or more gangable boxes together, you must first remove one set screw from each of the boxes that hold on the side plates. Use a screwdriver to remove the screws and set them aside for the reconnection process. They have right-handed threads, so you'll be turning the screwdriver counterclockwise.
Electrical Box Tips You Can Use