To free up a stuck shower diverter, shut off the water supply, unscrew the tub spout assembly, and soak it in warm white distilled vinegar for 45 minutes to dissolve hard water mineral crust. Once the scale is loosened, scrub the moving stem clean, rinse with water, coat all sliding surfaces with food-grade silicone plumber's grease, and screw the spout back onto the pipe nipple. Verification: Operate the diverter pull-pin multiple times to verify smooth, effortless movement.
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