I can't seem to get this to work correctly... If I understand, the goal is to have the part lay flat when it is setting on it's web. I have read section 5 many times and watched videos. When I flute, it brings the end of the rib up higher from the flat surface. If someone has a pic of the finished product that would be helpful.
https://photos.app.goo.gl/RpHVH1vyJNVfSmAs5
https://photos.app.goo.gl/RpHVH1vyJNVfSmAs5