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Double Glazed Door Lock Replacement Double-glazed door locks replacement may seem like a daunting task, but with the proper tools and step-by guideline, it's manageable. Replacing a window lock can give you extra security and boost the overall energy efficiency. Begin by removing the screw that holds the faceplate of the lock cylinder. Utilizing , turn the cylinder to the left. Replacement cylinders Euro lock door cylinders, or barrel locks, can be found in almost all uPVC double glazed doors, and provid