To loosen a faucet handle for maintenance or repair, 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 hidden beneath a decorative hot/cold indicator button), loosen it completely using an appropriate Allen wrench or flathead screwdriver, and pull the handle straight off the valve stem. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before starting repairs. Verification: Confirm that the handle detaches cleanly and exposes the underlying cartridge stem.
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