If I disregard my dominant eye and develop a vision center where the cue is between both eyes, I can see the right edge of the CB with my right eye and the left edge with my left eye.
I can then look at the shot at hand and starting with a CTE line (CTEL), (with the cue between my eyes), I will notice that for a cut shot to the left, with the CTEL on the right edge of the OB, my left eye is looking at the center of the OB (B), and for a cut shot to the right, with the CTEL on the left edge of the OB my right eye is looking at the center of the OB (B).
If the cut angle is 30 degrees, I don’t need to shift or pivot, but can just shoot the shot from that aim and stance (Hal said this).
If I want to reduce the cut angle (thick) to the left a bit, I would move the tip of my cue and my bridge ½ tip to the right and then move my stance and pivot back to the center of the CB and shoot.
If I want to increase the cut angle (thin) to the left a bit, I would move the tip of my cue and my bridge ½ tip to the left and then move my stance and pivot back to the center of the CB and shoot.
Starting at the CTEL and cutting the OB to the left, I can move my head/eye and stance slightly to the right (off of the CTEL) until my left eye in looking at the left ¼ (A) on the OB, get down and shoot a cut angle less than 30 degrees.
Again,
If I want to reduce the cut angle (thick) to the left a bit, I would move the tip of my cue and my bridge ½ tip to the right and then move my stance and pivot back to the center of the CB and shoot.
If I want to increase the cut angle (thin) to the left a bit, I would move the tip of my cue and my bridge ½ tip to the left and then move my stance and pivot back to the center of the CB and shoot.
Starting at the CTEL and cutting the OB to the left, I can move my head/eye and stance slightly to the left (off of the CTEL) until my left eye in looking at the right ¼ (C [3/4]) on the OB, get down and shoot a cut angle greater than 30 degrees.
I can do the same for 7/8 (1/8 inside of the OB edge) for thinner cuts.
I can take this to the table and memorize the resulting angles so that whenever I see those angles I will recall what the secondary aim fraction is - 1/8, ¼, ½, ¾ or 7/8, and add the ½ tip shift and pivot to get a bit thinner or thicker from there.
When Neslie O'Hare was shooting back in the day, she would take her stick and aim the tip almost touching the OB on the shot line. She would then pull the stick back 1 & 1/8" (1/2 OB diameter) and pivot from the tip until the shaft/butt was over the CB, get down and shoot at the spot where her tip was resting under the GB. She did this on almost every shot. I thought that was a cleaver method.
:thumbup: