To fix a single-handle leaky faucet, start by shutting 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 decorative cap and retaining clip. Pull out the old plastic or brass ceramic disc cartridge, insert a matching replacement cartridge, reassemble the handle components, 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 single handle in all mixing positions to ensure smooth flow and zero dripping.
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