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Double Glazed Door Lock Replacement Double glazed door locks replacement may seem like a daunting job, but with the proper tools and step-by steps instructions, it's doable. Replacing your window lock can improve the energy efficiency of your office or home and will also add security. Remove the screw that holds the retaining plate on the faceplate of the lock cylinder. Use a screwdriver and twist the cylinder to the left. Replacement cylinders Euro lock door cylinders or barrel locks, are present i