So I mean make circles like this:



Then Trim them all against each other and remove these areas:



- Michael

Then I think the ends match with circles and a little bit of lines here:



- Michael

Hi Chris, so this is what I got to (3DM attached also):




To finish it probably mirror that piece over then loft between pairs of edges and join those all up.

I'm not sure if it's accurate enough for what you need.

- Michael

And here is the result mirrored and lofted and joined. I have not checked how close it is to your original though.



- Michael

WOW! Thanks so much Michael. I had expected help as always, but this is above and beyond.

Best,

Chris

You're welcome Chris, I hope I gave enough details so you can get an idea of how it was done.

Reverse engineering can tend to be pretty tricky, it often involves kind of decoding design intent.

- Michael