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How to Replace a UPVC Door Lock The process of changing your uPVC lock might seem like a daunting job, but with the right preparation and knowledge it can be done without the need for a professional locksmith. Refer to the manual of the manufacturer for specific instructions, and gather all the tools and supplies prior to. First, locate the screw holding the barrel lock in place. Remove it and store it secure in a safe location. Replacement Locks There are numerous alternative locks for uPVC door doors th