Hi Martin, now that I go back and read your message again, it seems that was part of your question was how to figure out where to place the line. Sorry I did not quite pick up on that part, I was thinking you were just looking for a way to build it since Chamfer will not do that kind of result itself (it will on a cylinder but not here).

Well, as far as I can tell it's simply not specified in the drawing, so that would seem to me that it's precise placement is not considered all that important.

If placing at some spot that just looks good enough is not a good solution for you, I guess you would need to go back to the source that gave you that drawing and tell them that the drawing is underspecified and that you need more data in order to reproduce the shape properly.

- Michael