And I repeat, if the same thing can be achieved through multiple ways, how do I know I'm hitting center ball? You made a lot of definitive statements and waxed lyrical about center being the ONLY way to achieve this half ball roll-over effect as compared to the much more lenient stop shot.
SHUDDY - Again, you are only one talking about 'other cueing positions' and 'multiple ways',
no one else; because as I have stated multiple times, that is
not what this drill is about.
Repeat: this exercise is purely a Center Ball exercise.
To answer your Second Question:
If you carefully examine a circle-dot cue ball after shooting, you will see a chalk mark which reveals exactly where the cue tip impacted the cue ball -
provided the "student" has the common sense to properly set the dot on the cue ball and line-up the shot correctly - which is the empirical proof of hit location.
That's how we
"know" if we have,
or have not, hit center ball.
Secondly, provided the center ball hit has been achieved, the 1/2 ball diameter 'roll-over' effect, serves as the visual proof which confirms we have executed a straight stroke on center -
the true purpose of the drill to those who listen and understand - and
at the correct speed for the distance between the cue ball and the object ball, for this exercise.
Any speed,
too much speed or too less speed, or hitting off-axis left or right, leaves the cue ball elsewhere, and other than perfectly replacing the object ball's former position. That's the purpose of the 1/2 ball 'roll over' effect, it's a visual speedometer for CENTER BALL HIT; and does not include hitting the cue ball below the horizontal axis.
IN SUM: To hit CENTER BALL, and perfectly replace the OB's former position, by causing the CB to rotate 1/2 diameter after collision,
can only be done in this exercise with a perfect center ball hit, at perfect speed, with a perfectly straight stroke with no steering/off-line in the follow-through.
Hit that cue ball any other way, and you are talking about something else completely,
and talking to yourself.
Perfect and Pure hitting is the goal in this Bert Kinister exercise.
And that, is ALL that's going on here; building a true stroke, and learning to deliver a perfect center ball hit at given distance accurately, reliably, and consistently.
So again, SHODDY, we know Bert Kinister's credentials, CV, and proven and measurable track-record as a very successful coach/teacher; so, for the 3rd time, where's you list of world-class championship-level students you have personally trained?
Still waiting for that....
Hmmmmm; not really. - GJ