I service this mower for a friend. Was changing blades for him today and noticed these curves. Not familar with these mowers but this can't be right can it? Larger Picture...... http://img200.imageshack.us/img200/4057/hermer0074iw.jpg Also whenever I engage the blades,any motor speed, it makes a horrible rattling sound and then the motor dies. Sounds like a bucket of rocks under the deck. At first the belt was jumping off every time I engaged, but the motor would keep runnning. I tightened it and the belt stays on now but motor dies now when I engage. I have tried at numerous levels of tension and as long as it is not totally loose the belt stays on but motor will die. I don't think its a tension problem.