Indexable boring bar - videos

Indexable boring bar. By GAS 1950.

34:42 video:
https://www.youtube.com/watch?v=uBS5p07zG-0

13:28 video:
https://www.youtube.com/watch?v=k1izjVXsCxI

30:22 video:
https://www.youtube.com/watch?v=4voYEEi2NMQ&t=7s

I'm here because I saw a chuck in a chuck and needed more information.

Part 4. By GAS 1950. 32:06 video:

https://www.youtube.com/watch?v=XZ1kwGI77tk