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How to Change a Double Glazing Door Lock Replacing a broken window latch is a easy DIY project. To ensure that your double-glazed windows are safe and secure, it is essential to follow the correct steps. This example estimate includes the basic tasks that are performed in easily serviceable conditions by trade professionals, using standard, in-stock products and materials. Your actual costs will vary. How do I go about doing it? Window locks are often used and they get worn out over time. This can lead to