A pattern taped in place, bankable molding clay will be wrapped around it to finish the dam.
After the pour, you can see the dam in place. Also the screws holding the ferrule.
Cleaned up a bit and what I use to make the pours with.
Not a very good Pic but you can see all 4 bands in place.
The patterns for the diamond inlays on the left and the inlays themselves.
Starting on an inlay, a line divides the case and another crosses it to align it.