To take a single-handle faucet apart for repairs, start by shutting off the hot and cold water supply valves underneath the sink. Locate the small set-screw on the side or back of the handle (often concealed under a decorative button), loosen it with an Allen wrench, and pull the handle straight up. Unscrew the decorative sleeve or retaining nut, lift out the retaining clip, and pull the ceramic cartridge straight up out of the faucet body. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Inspect the removed cartridge for cracks, mineral buildup, or worn seals.
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