To fix a leaky faucet without calling a plumber, you can easily replace internal seals yourself. First, shut off the hot and cold water supply valves underneath the sink. Use an Allen wrench to loosen the handle set-screw, remove the handle, and take off the retaining nut to access the internal ceramic cartridge or rubber washers. Pull out the worn component, install an exact-matching replacement part, reassemble the handle, and turn the water back on. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before starting repairs. Verification: Test the faucet in both closed and open positions to confirm zero dripping.
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