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Double Glazing Window Locks Repairs Repairing double glazing window locks is vital to keeping your home safe. A damaged hinge or handle could let draughts in to your home and expose your windows to burglars. Fortunately, it's not difficult to fix stiff uPVC locks and handles without replacing the door or window. Simply cooling or oiling the mechanisms can often help solve any problems. Broken Glass Over time, double glazing window locks wear out. The handles may become difficult to open, or even close. Th