To fix a stuck or loose shower diverter button on a tub spout, shut off the water supply, unscrew the tub spout from the copper pipe nipple, and submerge it in warm white vinegar for 45 minutes to dissolve mineral scale. After descaling, rinse the button assembly, apply a generous coating of food-grade silicone plumber's grease to the internal sliding pin, and screw the spout back onto the wall securely. Verification: Press and pull the diverter button multiple times to verify smooth, snappy movement.
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