To loosen a stiff tap handle, start by shutting off the hot and cold water supply valves underneath the sink. Remove the handle set-screw with an Allen wrench, pull off the handle, and take out the internal cartridge or valve stem. Soak the components in warm white vinegar to dissolve hard water scale, coat the moving parts with waterproof silicone grease, and reassemble. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Move the handle through its full arc to confirm it operates smoothly and effortlessly.
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