My little rider mower is getting incredibly hard to steer. Seems that the 2 gears do not mesh smoothly under the front of it. The shaft the goes all the way to the top at the steering wheel has some slack allowing the shaft to not fit snugly upward. How can I improve the meshing of the steering gears? Can someone provide a link to a exploded view of the steering gears and where to re-order parts from? Thanks in advance