The machine I think you are talking about is based on the Wertheim, Claase etc 1860's machines.
They are crude but with the right set up can work very well. Primarily they are made for the third world market where they want a simple machine that is portable, can take all sorts of abuse and uses readily available needles.
The ABLE290 is what I call the machine and I offer a proper manual as well as a bobbin winder that actually works.