When I go to shoot I wear a shirt with a pocket and there is my chalk.
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On banks, the diamond system. the X system, the parallel shift system, the etc system - they are all just a starting point. A system will only work with a high degree is success if it is practiced and used on the same table because tables bank differently, balls bank differently, cloths' bank differently, and so on.
Find a system you like and use it as a starting point but do not think you are going to become Glen Rogers or Tony Fargo using a system. They got to the level they are at by doing one thing - banking balls. Throw 15 balls on the table and start banking. Ball in hand on every shot when you first start. It's not as easy as it sounds. Do five racks a day. Keep a count of how many strokes it takes to clear the table. In a month you will see that the stroke count has gone way down. Glen Rogers said something to the effect that if you want to be a great bank player - bank a million balls then you will start getting really good.
I have only recently become quite interested in banks to the piont of devoting a fair amount of effort to it. I believe it has to reach a point where it becomes instinct. Oh, I will still look at a diamond, or a mirror pocket, or a parallel line - but when I get down on the ball I want that gut feeling that it is going to go.
Keep after it. It will come. Later, Pel