Cadet, Husqvarna, Craftsman are all MTDs. the mower decks are identical. I had a craftsman and blew an engine. Bought a Husqvarna and my bagging system fit perfectly including all the bolt holes. I have replaced several belts, spindles and keepers. The deck has a rear tension spring that pulls the deck back. The spring attaches to the frame. It is hard as hell to pull. Makes sure it is attached. Also, the belt around the engine pulley is very loose. That is why they have belt keepers just behind the engine pulley. You said, it looked like it was too loose, but did you try it? This belt is so loose normally that it can fall off the engine pulley if the keepers are missing. Try it before you condemn it!