Quote Originally Posted by gabe View Post
We re-machined one of the cavities in a post production operation, reason why it is not plated.

BTW, I found a great product to erase minor surface scratches from the Delrin housing: brake cleaner.. it ever so slightly etches the skin of the Delrin, and gives it a very nice and smooth finish.
Brake cleaner is powerful stuff. For anyone who tries this, be sure not to get any on the rubber o-rings or any rubber seals. It's only safe on metals and strong plastics, such as Delrin.