This part was done by someone else trying to help me understand how to make a helix cut in a tube. I do not understand why when I roll back the FeatureTree to say Surface Extrude 5 and rebuild why I do not see this surface. If I right click and edit the feature I see it in the preview. The same thing applies to Surface Extrude 6 and Surface Loft 4. What am I not understanding about Solidworks that causes this to happen?

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