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How to Replace a UPVC Door Lock The process of changing your uPVC lock may appear like a daunting task but with the right preparation and knowledge it can be done without the use of a professional locksmith. Consult the manufacturer's manual for any specific instructions and gather all necessary tools and equipment prior to. Find the screw that holds the barrel lock in place. Remove it and store it safely. Replacement Locks There's a vast selection of replacement locks for uPVC doors, offering varying