Trouble with capping boundary blend
I have a troublesome rib that I'm developing.
The contour is variable through the length but towards the 2 ends the opening is a true diameter.
I can throw an axis on the edge of the opening and revolve a diameter, but unfortunately there is tangency angling into the end opening and the resulting diameter doesn't cross the true center of the open diameter, meaning the Revolve is not tangent with the Boundary Blend.
I've tried applying a Sweep through the red intersect curve shown in the attachment using the edge of the opening but could not get a result that worked.
I tried ISDX but it didn't allow tangency at the intersect with the edge.
I've also tried different combinations of Boundary Blend with no success.
In our other CAD software we would only need to use the Fill Gap command and as long as there was good tangency the problem was over with 2 clicks.
In my opinion this should be simple yet it's got me at wits end.
Any ideas in how to close this up with a tangent round surface?

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