So what exactly was damaged? You can drop the shaft out by just removing the pulley on top and tapping the haft and bearings out of the housing, but if you don't have access to an impact wrench, you may need to rebolt the mandrel back to the deck and use a breaker bar.
Ohhh, I get it now. yeah, I understand, but sheesh- no way I could have gotten that pulley off while attached to deck! No wayy. (not that its any easier on the bench....LOL!)