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How to Replace a UPVC Door Lock Changing your uPVC lock may appear like a daunting task, but with the right preparation and knowledge it can be accomplished without hiring an expert locksmith. Check the manual of the manufacturer for any specific instructions and gather all the tools and materials beforehand. Find the screw that holds the barrel lock in place. Remove it and store it safely. Replacement Locks There are a variety of replacement locks for uPVC door doors that offer various levels of se