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@kowalski
There's a good tutorial here: http://projekto-b.blogspot.com/2008/01/how-to-replace-your-cartridge-bearings.html
The original bearings in the generic Formula hub aren't actually 2RS. They have one rubber seal and one metal shield (and like the rest of the hub, they're somewhat low rent).
I haven't found bearings to that spec, though...
If you're doing the job on a Formula make sure you've at least got new locknuts for the rear hub.
Better yet chuck the hubs.
Mine have now had new bearings, new locknuts and new tracknuts.
Buy cheap, pay dear...