FWIW This became my instruction guideline, it may help someone else.
1) Put the piston on top dead center, make reference mark on case and hub adapter (TDC);
2) With the spark plug out..Lay it on the cylinder...Turn the ignition on..Slowly turn the sensor clockwise until you see/hear a spark..
3) Put a mark on the sensor mount directly at TDC mark on the case. (case, hub and sensor mount are all marked for TDC;
4) Measure the diameter of the hub close to the magnet. Diameter x pi x desired degree timing degrees / 360 give the straight line distance.
5) Measure that distance on the case, make a mark (Timing mark); Rotate sensor mount mark CW to align with case Timing mark. (on non-keyed prop hub: mark prop hub also)
End results: case, hub adapter, and sensor mount all marked TDC; case marked for desired degrees BTDC. Ability to quickly do a visual check to known reference marks.

On a 1.372" diam case gave these distances: (roughly 1/32" straight line per 3 degrees)
Degrees: IN Dist:
31 = 0.3712 "
28 = 0.3352
25 = 0.2993
22 = 0.2634
19 = 0.2275
16 = 0.1916