jeffbhhs

Got a question, just bought the Cobra trackside truer, and was not sure about a few things on it, since the instructions were TERRIBLE and really did not match the unit well.. The question that I had was where do I need to put the little plastic spacers do they go on the outside near the motor or outside near the tire? I was noticing that the axle that spins the tire could easiliy be pushed out of the bushings if there are no spacers...Also how do you know how much each pass will cut off with this thing? or do you just have to estimate how much you are taking off and then measure with a caliper or is there an easier way? Thanks and please let me know