The ball bearing is supposed to be there - that is actually the thrust point itself. Sounds like the manual is talking about the housing of the assembly itself, as opposed to the bearing. As for wobble, some wobble in a platter is normal on a lot of turntables. It is unlikely it have anything to do with the bearing itself, or the housing, but probably due to the platter itself not being perfectly flat and symetrical. Generally, this is not a big deal, unless it is so bad that the stylus is being bumped out of the groove.
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