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How to Replace a UPVC Door Lock Making changes to the lock on a uPVC door lock may seem daunting but with the proper preparation and knowledge you can do it yourself without the need to hire locksmith. Consult the manufacturer's manual for specific instructions, and gather all the tools and supplies prior to. Find the screw that holds the barrel lock. Take it off and store it secure in a safe location. Replacement Locks There are numerous alternatives to locks for uPVC door that offer varying levels o