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How to Replace a UPVC Door Lock Making changes to the lock on a uPVC door lock may appear daunting, but with the proper preparation and understanding, you can do it yourself, without hiring a locksmith. Check the manual of the manufacturer for specific instructions and gather all the tools and supplies prior to. Find the screw that holds the barrel lock in place. Remove it and store it in a safe place. Replacement Locks There's a wide range of replacement locks for uPVC doors, which offer varying levels