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Replacement Double Glazing Window Handles When a double-glazed window handle is damaged, it's important to get a replacement to ensure safety and function. uPVC handles are operated by the spindle, which is inserted into the middle of the handle and through the lock mechanism of the window frame. You will have to know the step height of your uPVC handle, which is determined by looking for screw cap caps on the inside face of the handle. Tilt Turn In Europe, tilt and turn windows are a common choice. Ho