Fixing a leaking or stiff Moen single-handle or two-handle faucet typically involves replacing the internal cartridge assembly rather than replacing the entire fixture. To complete this repair safely, first shut off the hot and cold water supply valves under the sink, plug the drain to prevent lost hardware, and carefully remove the decorative handle cap and retaining screw. Pull the handle off, remove the handle adapter and retaining clip or nut, and pull out the old cartridge using a cartridge-pulling tool. Insert the new genuine Moen cartridge, secure all components, and turn the water back on to verify the repair stops the leak.
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