This is good stuff.
I remember way back in 1957, Wimpy Lassiter came through Atlanta and beat Joe Cosgrove and then Danny Jones at Big Town Billiards at Five Points, downtown Atlanta. I was just a 17 year old kid.
Wimpy had a black line on the ferrule of his stick that had been drawn with an ink pen.
He said to us kids, that he used that line and center cue ball to make dead certain he was aiming on a half ball hit. On cuts, he always began at the half ball hit position, he said. Then he'd slightly pivot the stick with his bridge hand a tiny imperceptible amount when the shot required a hit other than half ball. The application of spin (english) was done by slightly rotating the cue clockwise or counter clockwise with the back hand while maintaining the same lineup.
Danny Jones jumped all over this technique right away (he was my boyhood pool playing idol). Billy Johnson, who was younger than all of us, did something similar also, except he didn't use the line.
Both of those players came out of Atlanta and I watched them for hours and hours for years right here when they were in prime form before they hit the road.
I have used that line on my stick for years. It certainly is a refining aid (and an AID only) when using the CTE method of playing.
This may be off topic, but your comments inspired me to type this. Hope it is not offensive to the thread.