Here's a video of what I think PaQ is describing.



I'm still a little unclear on what some of the measurements are with regard to the geometry that was in the original files. Like the 27.5 part.

Anyway, I also showed a couple cuts to represent the "15 mm" cut in the bottom? Wasn't sure how that was supposed to go. If either of those are correct, let us know.

Once the shape is nailed down to what you want, we can discuss various ways for you to get it done.

[EDIT] in the video I just used a tangent blend. The file attached is what PaQ referred to, where I recut the sphere to be just a half sphere, then I could use a G2 blend so it was smooth.[EDIT]