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Double Glazed Door Lock Replacement Double-glazed door lock replacement can seem like a daunting task but with the right tools and step by guideline, it's manageable. The replacement of a window lock can add security and boost your business or home's overall energy efficiency. Take off the screw that holds the faceplate of the lock cylinder. Use a screwdriver and twist the cylinder to the left. Replacement Cylinders Euro lock door cylinders or barrel locks, can be present in the majority of uPVC double gl