I have a Hobart A200 (20 qt) mixer, built in 1985. In 1988 it was in an industrial fire. I acquired it in 1989 and removed all of the transmission gears and oil (the grease had separated due to the fire). For the past 20 years it has been sitting in storage. The gears and grease had been removed and cleaned up. Now I am in the process of rebuilding it for my baking business. My concern is that one of the shafts was broken, possibly before the fire. I believed it was the worm wheel shaft because the worm gear showed excessive wear and tear. I ordered a new shaft and worm gear, but when they arrived, the shaft looked very different from the one I have. Could it be that a newer model A200 would have a different style shaft than the 1985 model? Unfortunately, having the mixer in pieces over the years, and moving around, I lost the cover plate that holds the ML number. I know I should be addressing this to Hobart, and I have. They have not yet replied, and if and when they do, they will undoubtedly state that "without the ML number, we are unable to supply you with any information." If anyone has any information that you can give me, it would be very helpful and greatly appreciated.