Is there any chance you could post the file either before you applied the shrinkwrap or after applied but still with the original geometry in the file? I am curious as to why you felt you needed to use the shrinkwrap command.Seems that you could achieve closed NURBS objects prior to covering the ring shank to a mesh.
Richard is 100% correct. It was really a modelling aid; cheating if you would. I was doing some speed modelling, so I decided that instead of fettling fillets, I’d just Shrinkwrap my way to the final model.