What axis is most like a squat spring axis?

The red shaft is most like a squat spring shaft. According to the relevant public information, the original intention of the red shaft design is to overcome two major problems of the squat spring shaft: one is that the shaft body is complex and the cost is too high, and the other is that the height of the shaft is too high, which does not conform to the ascending principle of ergonomics at that time, so the red shaft is most like the squat spring shaft.