Hi guys.
I've just measured the back of the cut down bearing.
The diameter of the hole at the rear (where Russ lathed down the hexagonal nut, there's a very slight wider opening) is 9.2mm.
That bears out our Andres' neck hole measurement.
The hole diameter inside before the wider opening is 8.8mm.
To address Andres' points:
1. Once the front face is lathed back by a couple of mm, the flat front face will be wider, thus making the hole (at the front) smaller.
2. I see the 'Blob' as natural weathering, as seen in the pics of the cut down bearing above. I don't see an actual raised 'blob.'
3. It's difficult to tell the circumference of the hole on the prop.
I've been watching the scene where the saber falls onto Obi's cloak over and over again, and it seems to me the light and dark stripes seen inside the emitter (cone) do not change. Therefore they seem to be permanent markings rather than reflecting the cloak.
I'll have more pics early next week, once Russ performs a few tweaks.