You don't need to use glue, Loctite make a Bearing liquid for just such circumstances!!
As for tolerances, I am sure said spacer is outsourced and some have come through oversize and I am sure you wouldn't want the cost of another member of staff attached to kits so they can sit there with a calliper checking ALL parts. Yes, it is an issue but let's not make a mountain out of a mole hill now.
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