Par4QC He might check them, but per his own words, he does not bother aligning them
And why is that? Because he is dealing with shafts that have a negligible spine.
So why does he go on to say:
When dealing with a shaft that I am not sure is spine-free (for practical purposes), I determine the spine by FLO, because it's quicker than Differential Deflection and, unlike feel finders, locates the true spine. Then I determine the size of the spine by comparing the frequency in the two FLO planes.