Hi Martin, yeah the non-planar rail revolve support is in here, I hope it will be useful!
And yes - in order for it to kick in, the profile curve must touch the axis of revolution at one endpoint. That kind of helps to make the origin of the scale to be really clear - the vertical scaling happens from that axis point. This makes it not dependent on the particular pick order for when you draw the axis line.
If you want to get it for something that does not touch the axis, then just like you saw you will want to put in an extension line with the extension line touching the axis and then you can remove that later.
- Michael
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