How I changed the cartridge (45883000) to fix a leaky faucet. Note that it matters which side (left or right) you are fixing when ordering the replacement c How to Fix a Loose Faucet Handle. Faucet handles become chiefly loose due to sloppy faucet replacement, or it just happens over time. A loose faucet handle is a common cause of a faucet leak, which you can fix if you recognize how. Here are the steps to follow to fix a shower faucet loose handle: Step 1 – Water shut-off Disconnect the Water Supply First. Turn off the water supply to the faucet before you disassemble it to stop a leak. Unscrew the nut holding the handle to the faucet body with a pair of slip-lock pliers. If the nut won't turn, don't force it. Lubricate it with spray lubricant, wait a few minutes, then try again. Download Article. 1. Turn off the water that runs to the sink. [1] Open the cabinet under the sink and you'll see the shutoff valves. Since you have 2 handles, you'll likely also have 2 shutoff valves—left for hot and right for cold. Shut them off one at a time, then see if your leak stops. Step 2: Removing the Faucet Handle. Now that the water supply is safely turned off, you can proceed with removing the faucet handle. Follow these detailed steps: Locate the Small Screw or Cap Disassemble your faucet. Inspect your faucet parts. Replace whatever part is needed and clean the parts as you go. Put the faucet back together. Test your water flow to see if the leak has stopped. Again, if you don’t have the knowledge, don’t try to fix your own leaky faucet. Call a professional! 1. Turn Off the Water Supply. One of the critical steps to fix a leaking faucet is to turn off the water supply to your working area. Not doing so could end up flooding your area. To shut off the water, look for the fixture shutoff valves below the sink, or around the tub, and turn the handles clockwise. Turn on the water at the shut-off valves and check for leaks around the base of the Kohler faucet. If necessary, use a wrench to tighten the packing nut slightly until the leak stops. Replace the handle, making sure that it is in the correct position according to Kohler's instructions. AZrI.