I have a 2006 Exmark Metro gear drive. When I push it in neutral it makes a clicking sound on the left side. I think it makes this sound while the machine is operating but I can't hear it over the motor. Also, I have heard to make good stripes the front of the deck should be a 1/4 inch lower then the rear. Can someone tell me how to change this. I have 2 washers on the top spindle and 2 washer on the bottom spindle. My rear axel adjustment hole is in position "D". Thanks!