Can't say much on the bender itself, but I love his channel and watched this last night. I don't think I have ever seen one of his videos that I was not thoroughly entertained by (as well as educated). I enjoyed watching his repair of the old bender, too, since I have a machinist vise that I would like to restore that looks like my dad got it from the trashcan of a HS shop class.
I was not sure if it was cast iron or ductile iron but have since found out it is ductile iron, so it should be OK to fill in the divots with weld filler material.