If your bathtub drain stopper will not lift or open, it is usually jammed by hard water mineral scale or a loose adjustment linkage. Unscrew the stopper knob or unscrew the entire stopper assembly counterclockwise, soak it in warm white vinegar for 45 minutes to dissolve scale crust, wipe it clean, and lubricate the moving threaded pin with food-grade silicone plumber's grease before reattaching. Verification: Test the lifting mechanism multiple times to ensure smooth open and close cycles.
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