To tighten a loose faucet base, you need to access the underside of the sink deck. Clear out stored items from the cabinet, lie down with a flashlight, and locate the large mounting nut or clamping bracket threaded onto the central faucet shank. Use an adjustable wrench or a specialized long-handled basin wrench to turn the mounting nut clockwise until it clamps the faucet firmly against the sink countertop. Callout type="warning" title="Hygiene Warning": Wear safety glasses to protect your eyes from falling cabinet debris. Verification: Try to wiggle the faucet spout from above to confirm it is completely rigid.
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