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Double Glazed Door Lock Replacement Double-glazed door locks can appear like a daunting task, but with the right tools and step by guideline, it's manageable. Replacing your window lock can increase the energy efficiency of your home or office and will also add security. Remove the screw that holds the retaining plate on the faceplate of your lock cylinder. Then use a screwdriver to turn it to the left and then remove the cylinder. Replacement Cylinders Euro lock barrel locks or door cylinders are availab