To fix a stiff and hard-to-turn faucet handle, you must clean and lubricate the internal valve mechanism. First, shut off the hot and cold water supply valves underneath the sink. Remove the handle set-screw using an Allen wrench, pull off the handle, and take out the ceramic cartridge or valve stem. Soak the parts in warm white vinegar to dissolve calcium scale, apply a generous coating of waterproof silicone grease to all moving seals, and reassemble. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before starting repairs. Verification: Move the handle through its full arc to confirm it operates smoothly and effortlessly.
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