Looking at your 3D geometry, the rod is along the global Z axis, which is inconsistent with the needs for an axisymmetric model, where you must put the rod centerline along the Y axis and draw only the +X radial slice. Since it is fairly simple geometry, you should just start from zero.

For complex 3D geometry, I have done the following in a CAD system: 1) Slice the solids about two planes to get a quarter model. 2) Extract faces on one of the slice planes. 3) Transform those faces to the XY plane putting the centerline along the Y axis.