Thanks Anis, yes the method is OK, but I spent all the time trying to get the method right, then no time left to get the object perfect!! But I haven't seen your final entry?
I learned a lot from this shape so I will show the method in case it is useful to someone:
Draw the first profile and revolve
Top view, show points, scale two selected points from centre
Front view, move two selected points down
This surface will not shell (see http://moi3d.com/forum/index.php?webtag=MOI&msg=2117.4)
So workaround discovered by DannyT, cut it in half then shell, then fillet edges
Also thanks to Danny, delete the two selected surfaces
Then mirror/copy and boolean union.
Voila:)
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