Working on this in OpenSCAD (well, BlockSCAD) now:

https://www.blockscad3d.com/community/projects/1814083

Trying to work out the triangles/chords to get the radiuses positioned --- a workable approach should be to:

- use a triangle to determine the position of the 8 degree rotation and position elements which define the top of the web offset by that distance

- use a chord/triangle to determine the position of the circle for the smaller radius

- chain another calculation from that to determine the position of the circle for the larger radius

- chain one final calculation to get the flat element which makes the end of the web co-planar with the flat top of the small cylinder

I need to go work in the yard for a bit, but I'll keep thinking this through and hopefully will finish it up this evening.

Couldn't let it go, but got everything except for the positioning of the small radius and maybe the height of the web slope is off (had to increase 2 to 2.05 to keep a gap from appearing).

I think if one laid out the radius stuff flat and then rotated it things would be easier to visualize.