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Replacement Double Glazing Window Handles If a double-glazed window handle breaks it is essential to replace it, ensuring safety and functionality. uPVC handles are operated by a spindle which runs through the middle of the handle into the lock mechanism in the window frame. The step height of a uPVC handle can be determined by examining the screw cap caps that are located on the inside of the handle. Tilt Turn In Europe tilt and turn windows have been a common choice. However they are just beginning