How to bank in pool using diamond system 🎱 For this one-rail bank system, we use the diamonds as references to find a consistent aiming point. Start by using your cue stick as a measuring tool to determine how many diamonds the object ball is away from the pocket you want to bank into. This is a mirror system, so on every shot we simply multiply by 2. Example: If the object ball is 2 diamonds away from the pocket, multiply that by 2. 2 × 2 = 4 Now, move the butt of your cue so it points to the