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How to Replace a UPVC Door Lock The process of changing your uPVC lock might seem like a daunting task however, with the proper preparation and the right knowledge, it can be accomplished without hiring a professional locksmith. Refer to the manuals of the manufacturer of the lock for any specific instructions. Make sure you have all the equipment and supplies prior to beginning. Find the screw that holds the barrel lock in position. Remove it and store it safely. Replacement Locks There are numerous