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How to Change a Double Glazing Door Lock If you have a broken window lock, replacing it is a simple DIY project. It's important to follow the proper steps to make sure that your double-glazed windows are safe and secure. This example estimate covers the basic tasks that are performed in serviceable conditions by trade professionals, employing common, IN STOCK products and materials. Your actual costs will differ. How to go about it Window locks are often used and may wear out over time. This can result i