While cutting grass a piece of wire got wrapped around the blade shaft. I removed the wire and started it back up and there was a terrible noise. Jacked it up again and noticed a place where the blade was hitting the cover. What can I do to fix the problem? I'm never done major work on a mower before (well, major to me). I also noticed the other blade was loose - can I just tightened it with a socket wrench and it should be okay? The mower is a craftsman 11HP, an older model. It was my father's and he bought it in the 80's. Also, I have it on jacks so I can reach the blades, but it is still difficult. How can I raise the mower to get to the blades easier? I am a women and don't have the strength of a man. I'd appreciate any advice. Thanks