To lubricate a faucet handle assembly, start by shutting off the hot and cold water supply valves under the sink and opening the handle to relieve pressure. Loosen the set-screw with an Allen wrench, remove the handle, and pull out the internal cartridge or stem. Wipe away debris, soak parts in white vinegar to remove scale, and apply a thin layer of food-grade silicone grease to the outer O-rings and moving stems before reassembling. 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 smooth, effortless movement.
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