I've replaced a wheel bearing on a friends astra van. It has a cartridge bearing not a compression type. Took the old one off and fitted the new one. The shaft sits slightly further through the hub than the old one. This means that if I pinch it up the nut goes on further. But this make the split pin on the castle nut redundant. Not really sure how to solve this problem . Do I leave it pinched up and use the split pin or tighten it how I'd like it and not use it. I could put another washer in it to space the nut out. Your thoughts?