Li Tiecheng left the factory due to his insistence on safety regulations and fairness principles, and opened a repair shop with his craftsmanship. He cooperated with Su Chunmei to undertake agricultural machinery maintenance and technical projects, insisting on signing contracts and acceptance according to standards. Facing blocked materials and stolen plans, he won customer trust with experimental data and quality records, finally completed the trial production of the gearbox and passed the appraisal, embarking on the development path of establishing himself through ability.