Trivial Rail Revolve?

 From:  Michael Gibson
598.4 In reply to 598.3 
> Your exemple works only if the Rectangle is a "square" else sides are deformed :)

Yeah, there isn't any way to avoid that type of deformation in rail revolve because it does a part of its work by a scale outward from the axis line. To place the profile along the farther point of the rectangle it is scaled to get there and scaling grows the entire shape.

- Michael