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How to Replace a UPVC Door Lock The process of changing the locks on a uPVC door lock can be a daunting task however, with the right preparation and the right knowledge, you can do it yourself, without hiring locksmith. Refer to the manuals of the lock manufacturer for specific instructions. Gather all tools and equipment prior to beginning. Find the screw that holds the barrel lock. Remove it and store it secure in a safe location. Replacement Locks There are many alternative locks for uPVC door that of