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Double Glazing Window Lock Repair Double-glazed windows are energy efficient and offer comfort throughout the year. However, there are problems that can arise. If a window is hard to open, it could allow cold and heat from your home. This also weakens the security of your home. Luckily, this can be easily fixed. Continue reading to find out more about upvc lock repair. Stiffness If you notice that your uPVC window handles are stiff or have trouble locking, it could be due to a lack of lubrication. The fac