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How to Fix a Stubborn Leaky Faucet

Step-by-Step Guide
Gather Your Tools
Before you begin, gather all the necessary tools: an adjustable wrench, a Phillips and flat-head screwdriver, a replacement O-ring or washer, plumber's tape, a bucket or small bowl, and possibly a pair of pliers.
Turn Off the Water Supply
Locate the water supply valves under your sink. Turn them clockwise to shut off the water supply to the faucet. If there are no shut-off valves, you may need to turn off the main water supply for your home.
Plug the Drain
To prevent any small parts from falling into the sink drain, use a sink plug, a dish rag, or a piece of tape to cover the drain hole. This will keep your workspace clean and ensure that no components are lost during repairs.
Remove the Faucet Handle
Using a screwdriver, remove the screw that secures the faucet handle to the base. If the handle doesn’t come off easily, gently wiggle it or use a flat-head screwdriver to pry it off, taking care not to damage the finish.
Take Off the Packing Nut
Once the handle is removed, you will see the packing nut. Use an adjustable wrench to carefully unscrew this nut (turning it counterclockwise). Be cautious, as excessive force can damage the faucet.
Identify the Type of Faucet
Faucets come in various types: compression, cartridge, ball, or disc. Knowing your faucet type will help you to understand what part is likely causing the leak and what needs to be replaced.
Inspect and Replace the Faulty Components
Check for worn-out washers, O-rings, or cartridges depending on the type of faucet you have. Replace these components with new ones that match the specifications of your faucet. Ensure you follow the correct orientation for the new parts.
Reassemble the Faucet
Reattach the packing nut and tighten it carefully with the adjustable wrench. Make sure not to overtighten as it can crack the faucet. Then, place the handle back in position and secure it with the screw.
Turn the Water Supply Back On
Slowly turn the water supply valves back on (counterclockwise) and check for any signs of leaks. Make sure to open the faucet to allow air to escape from the lines.
Test the Faucet
Turn the faucet on and off a few times to ensure it’s functioning properly. Observe for any leaks during and after operation. If leaks persist, double-check the installation of the washers or O-rings.
Clean Up
After confirming that the faucet is working properly, remove the drain plug or rag. Clean your tools and workspace, ensuring everything is put back in its designated place.