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Replacement Double Glazing Window Handles When a double-glazed window handle breaks, it is important to get a replacement, ensuring safety and functionality. uPVC handles are operated by a spinning wheel that runs through the middle of the handle to the lock mechanism in the window frame. You'll be required to know the step height of your uPVC handle which can be determined by looking for screw cover caps on the inside face of the handle. Tilt Turn In E