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Double Glazed Door Lock Replacement It may seem difficult to replace a double glazed door lock, but it's not impossible with the proper tools. The replacement of your window lock will increase the energy efficiency of your home or office and also provide additional security. Remove the retaining screw on the faceplate of the lock cylinder. Then, using a screwdriver, twist it to the left before removing the cylinder. Replacement cylinders Euro lock door cylinders, or barrel locks, are present in the maj