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Double Glazed Door Lock Replacement It can be difficult to replace a double-glazed door lock but it's not difficult with the proper tools. Replacing a window lock can add security and improve the overall energy efficiency. Remove the retaining screw on the faceplate of your lock cylinder. Use a screwdriver to twist it to the left and then remove the cylinder. Replacement cylinders Euro lock barrel locks or door cylinders are available in nearly all uPVC double glazed uPVC doors. They offer securit