Sweep Rail and Rotate Problem

So I am sweep 2 railing my outside surface with 2 circles that have the same center point. I then have a curve (a bracket that I would like to attach to that surface) that I am rotating along that same center point but as I go down the profile it starts to deviate from the original surface?

Is there any way to have these match up?Sweep Rotate Problem.3dm (1.2 MB)

The “circles” around which you are sweeping actually appear to be ellipses… Maybe you stretched them accidentally with gumball or something?

In any case, I would use Revolve and not Sweep2 to make your polysurface - more accurate, cleaner and guaranteed to be round… :smile: