the nut broke,not sure how as it was my brothers,he said it just fell apart,the blower has been used very little,he has JB welded the nut but I'd rather find a replacement... 8hp engine... I didn't write down the serial numbers as of yet,the snow blower is not at my house but at his and it a long ways away and I don't play to get down there for a week or so to mow the lawn...