Blue Sky-- Another method that you can use besides Johnny's $$$ option is to use Thread lock. I like the Tamiya because it is thicker than any of the usual suspects and does not run or pool in the hub.
As for method apply a thin bead around the outer diameter of both bearings then set into place with the usual shims on the axles let them set for about an hour and you should find most if not all the slop taken out. This works with both the alum and the stock graphite rear hubs.