If the blade has touched the deck, it is time to take it in and have a professional take a look at. Your blade probably needs to be replaced, at the leasted sharpened and balanced. By the way your posts read, I advise you not try to repair. In my opinion, you may cause more damage and injure yourself or someone else. Even straightening a crankshaft (which I would never attempt) should only be done by someone who has years of experience. My last post on this thread.