If your bathtub stopper mechanism refuses to pop up or open, it is usually jammed by hard water mineral scale or a misaligned linkage rod. Unscrew the stopper knob or unscrew the entire stopper assembly counterclockwise, submerge it in warm white vinegar for 45 minutes to dissolve calcium crust, wipe it clean, and lubricate the moving threaded pin with food-grade silicone plumber's grease before reattaching. Verification: Test the pop-up mechanism multiple times to ensure smooth open and close cycles.
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