It is held in with an o-ring above and below the spinner. It is designed to be removed easily or adjusted. So there is no machined in "spot" for it.
The powder coating and the spinner could be an issue...I am getting a T-Way painted and will report those results in the comments section as soon as I know.
Will the spinner be painted on the powder coated options...No. then it would create an interference issue for sure. Also, I think having some color contrast on the spinner is nice. The spinner is a raw piece of aluminum by the way.