Or you could just learn the visual for the final aim line. But you probably already do that.It's really just another way of understanding what you already know regarding being able to pivot back from final alignment to execute BHE when required. Though, the exactness of such will depend on the cue's pivot point and throw effects.
So if I aligned a shot for 1/2 tip of inside english (right to left cut, requiring a left to right pivot) from in the stance, and looked at the CTE ETA lines, perhaps I'd be pretty close to the visual perception that one learns to see.
Colin
pj
chgo