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Double Glazed Door Lock Replacement Double-glazed door lock replacement can seem like a daunting task, but with the proper tools and step-by guideline, it's manageable. Replacing a window lock could give you extra security and improve your business or home's overall energy efficiency. Begin by removing a 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 found in almost a