would you believe me if i just said he is a hobbiest lol, the story he gave me for why he made that was because his kids wanted him to haha. I just have to double confirm how big of tubing his tube bender can do. So far what i've gathered from him is that he is great with metal, he knows it very good and what he didnt know he would research. He doesnt seem to be very good on the mechanical side of things though "engine wise" the rotors are pretty sick on it to he had some guy CNC them out for him they have a spade design on them.