Level the plinth and ensure the bearing is at a perfect 90 degree. Most platters are not flat but dished so unless you use a level from edge to edge you'll be defeating the purpose. I always ensure that whatever the platform the table sits on is dead level first so it resembles a series of parellel lines rather than angles to conteract and offset each other. Critical IMO for suspended decks so springs are as equally tensioned as possible to support the weight as designed rather than an improperly used method of leveling.
Leveling your turntable, your approach?
Not satisfied still with the sound from my TT setup, I decided to revisit the leveling situation. I discovered it was fine side to side, it was slightly low in the back, by 1mm or so. However, I thought why not tackle the levelness as it effects the arc of the cartridge with an actual record on the platter. A whole new issue was presented as my 5" Empire spirit level spanned from label to rim of several records to dial in a new dead level as the stylus would ride. Have I reinvented the wheel on leveling, or is this a novel approach, Cheers, BR