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Double Glazed Door Lock Replacement It might seem difficult to replace a double-glazed door lock but it's not difficult with the right tools. Replacing your window lock can improve the energy efficiency of your home or office and will also add security. Begin by removing the screw for retaining 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 found in nearly all uPVC double glazed uPVC do