A couple of thoughts on this. The blue in the ball bearings speaks volumes about the heat that caused it all to seize up. The rust on the center suggests that this could have been washed down after use and then water would lie there and go to work on corrosion. For longevity on older model Craftsman tractors, I've found that inside storage, using a leaf blower to clean the deck top, and annual or more frequent inspection of the clutch and all mechanisms that get dust and grass debris on the deck top are kept clean and free. it's good that you got to the problem and that is fixable. Good job of staying in it. My oldest Craftsman look like it was a practice dummy for the high school welding class I've slapped so many patches and repairs on it, but it still cuts beautifully. The latest problem for me was failed ACR on the Briggs motor. That was a bit deeper repair than I was looking for but I got it done and fortunately most of the debris I was able to remove and now it's back up and running. My oldest craftsman (I have two) is my trim mower for fence lines at my farm and it takes a beating.