thank you, jk !
on this model, it shows it as not needing fixing. then i get the message that says, under "what's wrong", "imported entity has 6 check entity errors".
the IGES file i did this before, a bunch of the faces weren't displaying. that was the time it showed it needing fixing, and "it" fixed "it" (sWorks patched up my model so it looked allright with no error messages.)
yeah, it's a good feature. guess i'm getting pretty biased in terms of liking solidworks.
anyway, it might be an acceptable defect, on this new model. not sure till i fix it, if it can be fixed.
on the imperfect model that is displaying, i'm using axis, point/plane, to add an axis normal to the surface. again to find the center of the spherical surface.