A highly effective solution involves using internal repair clips, such as F-clips or Madison straps, designed to secure the box against the drywall from the inside. In older plastic boxes, physical impact or over-tightening can lead to a crack extending from a wire knockout or a complete fracture of the side wall. Minor structural damage that does not. Repair a broken plastic electrical box mounted in a ceiling or wall This article describes how to repair a ceiling light fixture electrical box that was falling out of the ceiling, beginning with an explanation of how and why broken plastic electrical box swing clamp supports allowed the electrical. Dear Mr. As an Amazon Associate, I earn from qualifying purchases. Using my links helps to keep this website FREE. Those tabs are useless, and brake often. Just get a screw long enough to go out the back and you're golden.