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Double Glazed Door Lock Replacement Double-glazed door locks can appear like a daunting task, but with the proper tools and step-by steps instructions, it's doable. The replacement of your window lock will increase the energy efficiency of your home or office and will also add security. Begin by removing a screw for retaining from the faceplate of the lock cylinder. Make use of a screwdriver to turn the cylinder to the left. Replacement Cylinders Euro lock door cylinders or barrel locks can be found in a