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Replacement Double Glazing Window Handles If a double-glazed window handle breaks, it is important to get a replacement to ensure safety and function. uPVC handles work on the spindle, which is inserted into the middle of the handle and through the lock mechanism inside the window frame. You will need 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 Europe, tilt and turn windo