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How to Replace a UPVC Door Lock Change your uPVC lock may appear like a daunting task but with the right preparation and knowledge it can be done without the use of a professional locksmith. Check the manual of the manufacturer for any specific instructions and gather all necessary tools and supplies prior to. Firstly, locate the screw holding the lock on the barrel. Remove it and store it secure in a safe location. Replacement Locks There is a huge range of replacement locks for uPVC doors, offerin