Formulate clear operation specifications and procedures, and specify the sequence, strength and times of tightening in each step to avoid employees from missing screws. Provide professional training on screwing, so that employees can master correct operation skills and norms. At the same time, provide necessary tools and support, such as electric screwdriver and torque wrench. , improve work efficiency and quality. Establish a quality inspection mechanism to check the quality of assembled or repaired equipment or parts, ensure that all screws are tightened according to regulations, and find and correct problems in time.