If your shower diverter pull-pin is seized and will not pull up, it is typically jammed by hard water calcium crust. Shut off the water supply, unscrew the tub spout from the wall, and soak it in warm white vinegar for 45 minutes to dissolve the mineral scale. Once loosened, rinse the spout, coat the moving pin with food-grade silicone plumber's grease, and screw the spout back onto the pipe. Verification: Pull and push the diverter pin multiple times to confirm effortless movement.
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