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Double Glazing Window Lock Repair Double glazed windows are energy efficient and offer comfort throughout the year. However, problems can arise. If a window is hard to open, this can leak valuable heat and cold from your home. It also weakens the security barriers in your home. Luckily, this can be fixed easily. Read on to learn more about how to repair upvc locks. Stiffness If you notice that your uPVC window handles are stiff or have difficulty locking, it may be down to lack of lubrication. If you lea