3.Extend both rows of arcs to their full length
4.Each row spreads outwards
5. From the two rels, four rels will come out.
6. The lower jaw is fixed with screws. The screws are fixed with thick wires.
7. Grasp the propeller and move the mpp fully as shown in the figure.
8. Through this movement and stretching, the bottom will be exposed. The spiral with thin wire will extend upward. After that, the end of the thick wire spiral is fixed with nails