Have a 2005 champ trailer, took to big o to re-pack wheel bearings and replace seals. New seals leaking, took back to big o and replaced seals, still leaking. Of course big o threw away original seals. Went to napa auto parts to get seals myself, they gave me a calibrator tool. Shaft size was 1.698 where seal rides. Big o put a 1.675 seal that leaked the second time. Napa said shaft is an odd size? Had to buy a seal that looked like for something different because they had no seal in the 1.500 size? Any clues or advice