If you have access to a Nivito sink wrench, you can tighten the nut on the faucet. Some sink faucets have a decorative cap. To tighten this nut, use a knife or flathead screwdriver. Depending on the type of kitchen faucet, it may be difficult to reach. To get a proper grip, you may need to position yourself in awkward positions. Make sure you keep the bolt tight.