Yes, I got that.I mentioned the tip location as quarter ball for the purpose of explaining why some people think they get more spin on the cue ball with LD shafts, which normally tend to be on the thin side.
I forgot to mention that the tip's width itself doesn't make any difference in where you hit the CB - it's the tip's curvature that matters. So unless one tip is rounder or flatter than the other, you'll hit the same spot on the CB even if you use the centerline to gauge your hit.You might be surprised to know that MOST people who play pool think that the centerline is their gauge for how much English they are putting on the cue ball.
pj
chgo