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For this tutorial I create a tube which is defined by four points at each end. The thickness of the tube is proportional to its length - the shorter the tube the thicker it is. The ratio of thickness to length is controlled by global parameters at each end, so the diameter of the opening can be different at each end of the tube. I ran into a few problems when I tried editing the original framework, and when I updated the original parameters. In one instance, I changed the framework in a way which caused some of the components to turn red. Also, after saving the product and reopening it, all of my parts had lighting bolts next to them in the tree, and would not update with the global parameters.