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normal along geometry

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Seems like i am stuck on something simple but not that simple.

I have a tube with no subdivision. I am trying to get the normal to point along the edges of the tube . I managed to get it using some simple vector subtraction. 

The problem is when I try and scale the bottom of the tube, the normals do not respect the direction anymore and they point outwards. How can I fix this so that it respects the direction and angle of the geometry.... I will attach my file and some photos to show you what i mean. 


Also if you open up my file you will see on the side that I was also trying to rebuild each circle from scratch so that I can subtract them to get a Normal but I don't know how to bridge them together to create geometry...

Thank you. 




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