Very Interesting ideas incorporated into the design of that. I wonder if the shaft/arbor/mount is stressed due to the possibly-out-of-balance rotating bits and pieces. It also scares me that he has to put his hand right near the rotating assembly while it is in operation.
I know that is only a demonstration, but the part in question could have more easily been created in a lathe to begin with.
As I said above, some interesting ideas that might be used to design one's own homemade tooling, but I don't think I would rush into a copy of this any time soon.
ShopShoe