My brother gave me his old lawn mower, and whenever I ask him a question about it, his response is "Figure it out Blondie". Im not a dumb blonde and Ive figured out most of the controls, excep two. One is a screw knob on the left hand side of the sterring wheel, and the other is a long metal stick on the right side of the mower. If anybody can enlighten me on what these do, I would really appreciate it. Thank You in advance