Fixing a stiff tap lever requires servicing the internal cartridge or ball assembly. Start by shutting off the water supply valves under the sink. Loosen the handle set-screw with an Allen wrench, remove the lever, and pull out the internal cartridge. Soak the components in white vinegar for 30 minutes to eliminate hard water mineral crust, coat the moving O-rings and stem with waterproof food-grade silicone grease, and reassemble the fixture. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Test the lever to ensure it moves smoothly with minimal resistance in all directions.
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