Well. Here I thought I'd be pissed off at
@DavidR8 because now I'd have to get off my butt and finish a project #42. But it turns out I have some time to contemplate things yet again.
The fitting nuts arrived. Hmmmm. What's wrong with this picture?
View attachment 47656
Turns out flange to Nut on the cooler is about 0.623" while edge of nut to bottom shoulder is over 0.75". I wonder if that dimension is even a parameter when ordering nuts.
Ah well. I do have a lathe and other than ruining the nice blue I know how to shorten this.