It just appeared on blackbag http://www.toool.nl/assa-twin-part1.pdf and as Barry puts it:
"As always, Han covers the lock deeply, answering many questions. Questions you did not even know you had"
It is certainly quite a deep, and is only part one of two, but you can read it a dozen times and learn something new each time. The twins are some of my most favorite locks and certainly are manufactured with some amazing precision and technology.
If after reading the article you want to get your hand on some twins I am still trading them so just message me. You can also find twins in the large toool lot in BST and remember its going 100% to zeke so bid high!