I’ll admit I got lost while putting this together, mostly on the technical aspect. I knew I was supposed to use the rotate function, but what do the operators do? Number of steps is pretty straightforward (I think), but when I got down to axis I kind of whaaaaaat? Can someone explain in layman’s terms exactly what the axis function in the operator does?
Ha i love puns 
So yeah steps is how many extrusions you want to have made for that mesh you selected. This extrusion will be done within the angle selected. We needed a full enclosed model so 360 degree spin makes sense.
So how does blender know where to spin the selected mesh?
Well it will be done from the center settings selected. (0,0,0) resulting in the center of origin of the selected mesh, in our case the curve.
If you visualise it in your mind, this imaginary point being inside the center of the pin and thus the spin must occur around this center point.
As far as axis goes, try thinking about putting a pin through the model, so if we would put a pin(needle) through top->bottom, in our case the z-axis everything could only spin around those points (in case x,y is 0).
if you for example set the x and z it will try to spin the mesh around these axis, which will result in this weird side effect.
The value is between -1 and 1 and this can be used for example for the direction of the spin, in our case in z clockwise our counterclockwise.
