Build of a permanent magnetic chuck / base / vise. Part III: finale

As far as I know, there are no videos on RUclips about building a magnetic chuck based on permanent magnets. Apparently the traditional build is too demanding for a home shop. In the RUclips videos I only see transformers used in big heavy bulky electromagnetic chucks. I want something smaller, nicer and more refined. Suitable for a mini mill and based on neodymium magnets. Here's the third and last part of an attempt to do so. After building the vise, I put it to the test.
Music: "Here we go again.." Norah Jones, Ray Charles
MusOpen: Pachelbel, Canon in d major by Kevin McLeod
MusOpen: Beethoven, Sonata 32 for Piano, by Paul Pitman