I was changing the blades on my Hustler 48" walkbehind this afternoon and the blade saddle came off with the middle blade. What could have caused this and what should be done to fix it? Should I attempt to fix it, or take it on to the shop. Also the small metal "key" came off with it as well. Any help would be appreciated. thanks. BTW This is the first time I've taken the blades off since I greased the deck spindle housing. Could that have had anything to do with it?