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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 right tools. Replacing a window lock can give you extra security and boost your business or home's overall energy efficiency. Remove the screw that holds the retaining plate on the faceplate of the lock cylinder. Then, using a screwdriver, turn it to the left before removing the cylinder. Replacement cylinders Euro lock barrel locks or door cylinders are found in nearly all uPVC do