The left 2, left 5, left 6 and left 7 are tested clockwise, so don't move because the No.3 and No.4 screw tubes are adjusted up and down, and because the No.3 and No.4 screw tubes are in the middle of the machine, we press down the left 1 2, No.5, No.6 and No.7, so as to make these rollers at both ends of the machine move down in an arc, and push the shelf tubes to the right by using the principle of inclined plane (the first picture)
Hand-drawn), so the effect of squeezing both ends to the right without moving in the middle (No.3 and No.4) just corrected the problem that shelf tube bent to the left when he came out. If the shelf tube is bent to the right, adjust the five screws on the right clockwise in the opposite way (No.12567 on the right in the second picture).