When bathtub overflow cover screws snap off inside the mounting bracket due to rust or over-tightening, you must extract the remaining threaded shaft. First, spray penetrating oil around the broken screw fragments and let it sit for 30 minutes to loosen mineral corrosion. Grip the protruding stub with locking pliers (Vise-Grips) and slowly turn counterclockwise to unscrew it. If the screw is flush or recessed, use a small screw extractor bit with a drill. Callout type="warning" title="Hygiene Warning": Wear safety glasses while drilling or extracting broken metal screws to protect your eyes. Verification: Test fit a new stainless steel screw into the threaded hole to ensure it screws in smoothly without binding.
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