> Tricky indeed and show the power of the function rail Revolve! + Editing move points :)

Sometimes when you see that things are arranged to have poles, that can be kind of a clue that rail revolve might work well as a base surface...

The nice thing about rail revolve is that the surface it generates inherits the exact same control point structure as the curves that are used. This is a lot different than some other functions like sweep for example, which go through a type of fitting process that generates a lot of extra points.

So the results of sweep are not very friendly to manipulate with surface points, because each surface point that you move only changes a small region of the surface - this makes it hard to move the points around without causing bumps and lumps.

When you have a smaller number of surface points like rail revolve generates, that makes it easier to tweak them and not get lumps.

In this case one part that I didn't mention is that I added one control point to the profile curve so that the surface would have a good point to edit in one of the wider areas - the original curve was actually too sparse and it wasn't easy to tweak the surface to conform to the profile without having one more point in there.

Every once in a while it can work to switch your perception of what is a profile and what is a rail, like in this case for rail revolve it involved a reversal of thinking more of profiles in a radial sense around the poles, rather than profiles moving along slices of the object.

- Michael