FX Can some explain this picture

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In every video I've seen, the valve has only 4 lines.
 
Don’t pay attention to lines. They really don’t even serve a purpose. If they did serve a purpose the valve knob would look like a micrometer. But it doesn’t. Pay attention to your chronograph. Then bust out your digital calipers when you find a setting you like. I start all my tuning way out beyond the first line. Then turn it in until it first makes a difference and take a measurement then jot that number down. That number will stay in my notes for the starting point for that reg/hammer setting if I ever tear the gun apart or experiment with other reg settings or projectiles.
 
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