Replacing the internal cartridge in a bathroom faucet is a straightforward DIY maintenance procedure. First, shut off the hot and cold water supply valves located directly beneath the sink, plug the drain basin to prevent losing small fasteners, and remove the handle by loosening its set screw or popping off the decorative index cap. Carefully extract the retaining nut or clip securing the assembly, pull the old cartridge straight out, clean any mineral scale from the inner chamber, and insert the new matching replacement cartridge.
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