My comment about the hub was more about checking it for wear at the point where the seal rides on the surface. If the seal is sufficiently off center along the long axis of the hub then rotating the hub front to back would offer a no cost repair option. I don't remember the contact patch being sufficiently off center; but, it is approximately 10 years since I did the rebuild. When I did my rebuild the hubs were available for much less than £70 so replacement with new was not a significant decision. However, unless machine shop bill-out rates are much less than they are here I don't think you could get the hub filled up with weld and then machined down for less than £70. That said, the salient point is check the hub for wear. If its worn, whether you replace it, rotate it front to back or repair it are options to be pursued.
As mentioned by sleek lemur, I am aware that there can be problems with rear seal leakage. I think that this problem has more to do with incorrect installation of the seal housing during installation which ends up with the seal being off center. The attachment of the rear seal housing has more opportunity for alignment errors than the front and I am not aware of leakage issues with the front lip seals. The rear seal is also much larger in diameter so more challenging to 'seal'.
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