Stop in for a cup of coffee

Chis, if you are talking a difference of 70.3 vs 70.6 mm that is about 12 thousandths of an inch. (average human hair is 0.003" so 4 ish) Sand paper wheel on die grinder would easily be done and barely touching it.
Now here’s a question, could I not sand down the flat, outer edge of the center hub to let it clear as well?