Oh, how I can appreciate someone's abilities with the puns.
On a more serious note, that's a one off. Main reason being that the bearings were found items from a defunct camera, not something off the shelf.
The hull itself isn't really integral to the knife. I don't have a knurling attachment for my little lathe so I was looking for something to give me more grip... and got creative.
You could probably whip one up from an existing swivel knife, turned or filed down to fit inside the hull. Drill out the spent primer to fit... In other words, have fun with it.