Hi Michael, and many thanks for your quick reply.

I have had some different results during my trials to get this done. And I have always been in Front view.

I have had those that you show in your screenshot : It seems that on one side of the "break", the blend is more like a G0, ie. very hard. And certainly not like the G1 and the bulge that I have originally created.

Then I have had another result that is some sort of self-inflection. This is shown in the attached file. Which is, just to be clear, the same file I have uploaded earlier plus an offset command of 1. So your offset result is very different from mine, it seems.

If you will, let's not waste energy on this. For me it is just an exercise, and I will find a way. No problem.

Thanks anyway, really,
Ditto