My next project involves the manufacture of a bead-disc to the Western Television (Sanabria) 45/15 (3i) standard.
There is a table of dimensions in the Appendix of Peter Yanczer's book.
All contemporary information would be most welcome. It was a popular standard, used by various West Coast stations, and made simple by its mains-derived synchronism. The disc is naturally well-balanced, of course.