- Add axis
        - Add lines like this (use front view):

                                z
                    __    ...   |       ...    __
                .__|  |__|      +---x      |__|  |__.

              -130         .... 0 ....              130

        - Invoke the extrude req:
                to length 200
                scale x   0.5
                sections  10
        - Add a primitive tube: radius 120
        - Scale down the tube: 70% only y (shift-y)
        - Adjust the tube position to cut the extruded shape like this:
                          _________
                         /         \
                        /\         /\        top view
                       /__\_______/__\

                        |           |
                      cutted      cutted

        - Select extruded shape then tube and slice them
        - Delete resulting objs except the 2 'planes'
          ('planes' should be part.2 and part.3):
                          _________
              part.2     /---------\

                           and this          top view
                          _________
                         /         \
              part.3    /           \
                        \_         _/
                          ---------

        - Select first part.2 and then part.3, join them
        - Invoke mold req and conform to sphere:
                sphere radius 100
                object radius 320

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