(1) Reason: During the operation process, the action is slow and the strength is not enough, the ear tag pliers are too thick and do not fully enter the internal control, the main mark cone is not aligned with the sub-mark hole, and the ear tag wearing position is not suitable

(2) Method: Use the pliers needle consistent with the inner aperture, the main mark cone head is aligned with the sub-mark when marking, and the ear tag is worn at a relatively thin position of the livestock ear, and the operation process moves quickly and powerfully.