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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 steps instructions, it's doable. Replacing a window lock could help provide extra security and boost the overall energy efficiency. Begin by removing the retaining screw from the faceplate of the lock cylinder. Use a screwdriver and twist the cylinder to the left. Replacement Cylinders Euro lock barrel locks or door cylinders are available in nearly all uPVC