The phaco tip is buried in the center of the nucleus with high vaccum. Then, the 1.5mm chopper is inserted through the side-port and placed opposite the main incision at the edge of the nucleus. The chopper is positioned under the lower edge of the capsulorhexis and pulled toward the phaco tip. The two instruments are then moved in opposite directions to divide the nucleus into halves. This process is continued and the chopper is used to break the nucleus in smaller fragments.