By paying attention to the hands, PP#1's travel. (see drills section)
A lot of folks get hung up paying attention to the shaft, but IMO it is far, far simpler to look at the hands and their travel.
Snead's "Wagon Wheel" and a focus on the hands are much easier to teach and explain than plane shifts etc. Within Homer's views of plane, I understand where he was coming from, but I think a LOT of people forget how he defined plane - "center of gravity" Per 2-F - not shaft.
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"Support the On Plane Swinging Force in Balance"
"we have no friends, we have no enemies, we have only teachers"
Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2