Step 6 · Reattach Handle and Test Faucet

Place the faucet handle back onto the new cartridge stem, ensuring it is positioned correctly. Re-insert the retaining screw and tighten it clockwise with your Phillips screwdriver or Allen wrench until it is snug. Push the decorative cap back into place over the screw until it clicks. Go back under the sink and slowly turn the shutoff valves counter-clockwise to restore the water supply. Open the faucet handle you repaired to check that water flows properly. Then, turn the faucet off and carefully observe the spout for several minutes. Also, inspect the base of the handle and under the sink for any signs of leaks. If everything remains dry, you have successfully fixed the drip.