I may be going about this the wrong way.
I want to create a Mobius ring. I managed to do it by twisting (rotating using proportional editing) then using a curve modifier. But the faces were full of creases no matter how I smoothed them.
I then tried to extrude a plane converted to a curve which was getting there. But I cannot see a way to join two edges of the Mobius ring with a surface. I would appreciate any pointers.