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How to Change a Double Glazing Door Lock If you've broken a window lock, replacing it is a relatively easy DIY project. To ensure that your double-glazed windows remain safe and secure, you need to take the right steps. This example estimate covers basic work that is performed in easily serviceable conditions by trade professionals using common, IN STOCK products and materials. Your actual costs will vary. How to go about it Window locks are often used and may wear out over time. This can result in the nee