Thank you so much. Worked like a dream!

Hi guys, I've created a mobius shape by sweeping a rectangle around a circular shape. I've rotated -180 degrees to achieve the desired effect but im left with a tiny hairline 'gap' that i cant get rid of. I can obviously get rid in photoshop but I've got a few different types to create so was hoping somebody might be able to help. I've tried subdivision and a few other things but nothing will get rid of the 'gap'.
I've searched the forums for an answer but I cant find anything.

Thanks guys. Maxi