``Create an undertow on the water surface with only a dead slow retrieve while the main body remains underwater as much as possible'' was the biggest theme in the development of Spank Walker. This keyword sounds like a contradiction, but it can't be helped because it was one of the answers I received from the fish I spent several years doing fieldwork with. In order to resolve such contradictions, we achieved consistency through the combination of ``the body's volume, lip, and internal structure,'' and the result was a ``spank wave action'' that draws a precise roll action but also an intense trajectory on the water surface. The new internal structure has a mechanism in which only one of the three iron ball balancers is linked to the roll action, changing the tone and rhythm as it moves back and forth from side to side, giving a pulsating dynamic to the one-knock metronome sound that tends to be monotonous. Another meaning is that it's a small way to avoid getting bored with dead-slow games during night games when visibility is poor. This is a consideration to maintain concentration and anticipation for the water surface explosion that will someday occur. POZIDRIVE garage SPANK WALKER 133F POZIDRIVE garage SPANK WALKER 133F