hi, i have this unit, after calibration is complete, when i was measuring the toe, step 1 i adjusted the laser rail, levelling pad to shoot the laser on the center of mirror, Step 2 then I went to the mirror rail and adjusted the levelling pad to bounce back the laser back to shutter pad step 3 then i adjusted laser angle to find minutes. Between Step 1 and 2 after i adjust the levelling pad, i readjusted the wheel pin just in case if it is off.. then i did Step 3.. is my understanding correct.