How to Fix A Single-Handle Bathroom Faucets - Before you consider calling in for commercial help to repair, kitchen faucets look at what is involved in repairing the faucets you have. - The initial common issue you are tasked with when doing a home repair is to open the kitchen faucet mechanism itself. To this you have to unscrew the Allen screw that holds it all together. If you can’t unscrew the Allen screw to remove the handle from the rotary ball on the faucet. Don't worry, you should not consider giving up and stepping out to buy a completely new faucet unit? No. Don't let that 15cent screw drive you into buying a $100