​Chen Jinyuan and Chi Zhaojiu both are veteran mold-making technicians working at the Guangxi Yuchai Machinery Group, a major manufacturing company in China. In the early 2000s, with an unyielding faith in their own ingenuity, they and their fellow workers made a key breakthrough in developing a cost-effective mold for diesel engines. In this episode of Footprints, let's follow these two master technicians to see what their work is like and how they overcame one challenge after another to help their company and the country to gain manufacturing prowess.