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Double Glazed Door Lock Replacement Double glazed door lock replacement can seem like a daunting job, but with the right tools and step by step instructions it is manageable. Replacing a window lock could give you extra security and boost your business or home's overall energy efficiency. Begin by removing the screw that holds the faceplate of the lock cylinder. Use a screwdriver to turn it to the left and remove the cylinder. or door cylinders are available in nearly all uPVC double-glazed uPVC doors.