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Double Glazing Window Lock Repair Double-glazed windows are energy-efficient and provide comfort all year round. However, there are problems that can arise. If you have a difficult opening a door, it can cause your home to lose valuable heat or cold. This also weakens your home's security barriers. It is usually a simple fix. Read on to learn more about how to repair upvc locks. Stiffness If you notice that your uPVC window handles are spongy or have a difficult time locking, it may be due to a the la