I've come across the same problem on a mates 600 monster back wheel (RHS) bearing.A new bearing was still too slack. I think you could say the bearing housing in the wheel casting has gone slightly oval. Apparently some decent bearing suppliers do a kit ...think it consists of a sleeve/collar to fit into the wheel then you need to machine it out to fit the new bearing nice and snug. I'll let you know how it progresses.
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