Day: July 7, 2022

Put a wooden stick under the lower arm.
Then press the “down” button on the control panel. Keep pushing until the upper arm chuck height is the same as the lower one. Then stop.
Use a wrench to fix the screws on the arm surface.
Lock the screws on the back side of the arm.
Follow the above tips, and you will solve the problem perfectly. It is just one step of machine adjustment.