First turn the water off to the faucet from below the sink.
These valves are seldom used so it may turn hard.
Turn it clockwise to shut the water off.
Turn the faucet on to be sure the water is off, and relieve the pressure.
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Pop the top off the top of the faucet handle to expose the screw that holds the handle on.
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Remove the screw and handle.
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Remember the orientation of the plastic cartridge.
Using the adjustable wrench loosen the large nut holding the cartridge in.
Lift the cartridge out.
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Inside you will find a rubber seat and spring, remove these.
Check the bottom of the cartridge and be sure the flat under surface is smooth and not cracked.
If it cracked or cut or rough, replace it.
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Check the size of the rubber seat and spring with the new ones to be sure they will fit, and set the new ones in place.
Sliding them onto your screwdriver's shaft, and then guiding them into the proper place.
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Install the cartridge in the original orientation.
Replace the nut and tighten (not too tight).
Replace the handle and screw it down.
Check for smooth operation, then turn on the water from below, and again check operation.
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