Can you just ok the following.
You maintain your two visual lines and move in between the two visual lines, and with a slanted cue shaft you move in to the 1/2 tip of centre cue ball, then pivot.
when you have the two lines in your visual. you now have the cue ball frozen in place also! there is a left and a right edge of the cue ball locked and visible at this point, you need to hold your 2 line visuals and move straight into a 1/2 tip offset of the vertical axis of the cue ball (center cue ball) its really pretty simple its best to ask questions in the other thread also, this thread will get flamed by a few super duper really smart guys! :thumbup: