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Double Glazed Door Lock Replacement It might seem difficult to replace a double glazed door lock however it's not that difficult with the right tools. Replacing a window lock can add security and improve your business or home's overall energy efficiency. Take off the screw that holds the faceplate of your lock cylinder. Utilizing a screwdriver, turn the cylinder to the left. Replacement cylinders Euro lock barrel locks or door cylinders are available in nearly all uPVC double glazed uPVC doors. They off