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How to Replace a UPVC Door Lock The process of changing a uPVC door lock can appear daunting, but with the proper preparation and understanding, you can make it happen yourself, without hiring a locksmith. Check the manual of the manufacturer for any specific instructions and gather all necessary tools and supplies prior to. Find the screw that holds the barrel lock. Remove it and keep it safe somewhere. Replacement Locks There are a variety of alternative locks for uPVC door that provide varying level