I've always wondered why striped jewels and sections weren't used on all Vac models. My initial guess would be that they were a mark of premium quality for high-end Vacs, but apart from that, are there other reasons for their limited use? Was the striped celluloid structurally more difficult to fashion for the purposes of a section? Perhaps it was a method of conserving the limited supply of precious rod stock?
Additionally, I noticed that no Azure Vacs have striped sections or jewels even for Senior Maximas. Any thoughts on this?