Stray Geometry ...
 

I have a piece of bad NURBS surface geometry I need to make go away. Rebuilding takes care of it but the resulting geometry doesn't match the original object. I don't use the "Rebuild" tool enough to know what I'm doing wrong or what to expect of it. Or is this even the right approach to this problem. Once again, this is a small isolated part of a larger more complex piece of geometry. It appears to have originated in the CAD file created by the companies engineers.

Sorry, I forgot to attach the image ...
 

Here is the screen grab ...

how does it look when you render it? a lot of times nurbs objects look really screwed up in the viewport, and it's not a graphics card problem, it's a preview tesselation problem... so if it looks like crap in the viewport but renders out ok i'd say ignore it.