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How to Change a Double Glazing Door Lock If you have a broken window lock, repairing it is a simple DIY project. It's important to follow the proper steps to ensure that your double-glazed windows are safe and secure. This estimate is based on basic work that is performed in a accessible condition by trade professionals using common materials and products that are in-stock. The actual cost will be different. How do I go about doing it? Window locks are used often, and they can become worn out over time. T