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How to Replace a UPVC Door Lock Changing the locks on a uPVC door lock might appear daunting however, with the right preparation and the right knowledge, you can make it happen yourself without the need to hire locksmith. Consult the manufacturer's manual for specific instructions, and gather all necessary tools and materials beforehand. First look for the screw that holds the barrel lock in place. Take it off and put it away in a safe location. Replacement Locks There's a vast selection of replacement