Vic,
In the years I was in business, I developed a friendship with gent from Indiana who had a transmission shop. He also built drivelines. I took him a shaft off of the QA snowthrowers and had him put together a build sheet for it. I had planned to have him make up some for the purpose of resale/exchange for people who didn't have the "know how" or the time to do it themselves, or in the even that whole shaft replacement was necessary. I do not know off the top of my head if the Haban blowers use the same shaft dim's but I can see just by looking it is close. If you need help, let me know. Even if you had to ship the shaft so it could be copied and rebuilt using standard industry parts, I don't think it would be very costly. Let me know if you need help. I would be willing to handle it for you, or put you in contact with my friend.