Hmm, I found a (maybe) better way. I created a new material slot (copy from the Metal rough) with the the anisotropic option set to 1 like so:

And I assigned the desired to faces to it and it works like a charm. For some reason it works also for the selected knob, without using the tangend node. If I use the Y axis in the tangent node it will not work. I’m using Blender 5.1
