So it was, after all, the rivets. They aren't hex screws any more. The rivets were not allowing the spacer to do it's job properly, resulting in some wobble in the cassette. Since I tightened the living snot out of the cassette (a different story for a different time, but, suffice to say, the correct torque to put on the cassette is N-1, where N=how much torque I put on it) the spacer had a couple ridges, LBS filed those ridges out, everything is a-ok now.
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