I just got my het 6904 fan and 2w-20 motor. I didnt check that the impeller was centered perfectly and sure enough, a light touch of throttle and it scraped. There isnt any amount of finegling I can do to get the motor shaft centered. Is there a trick to getting it centered? Or do I contact EJF about this? I know I have to balance the impeller and polish the fan bore.
Edwin