During the lifting process of the sparkless hand to pull up the heavy tool, whether the heavy object rises or decreases, when the bracelet is dragging, it should be evenly and slow, so as not to be too hard to avoid the bracelet beating or the stuck ring. The operator should stop using it immediately when he finds that the hand pulls is greater than the normal pull force. Maintenance method: After use, clean the gourd and apply rusty oil to store them in a dry place. Those who are more familiar with the gourd mechanism should be carried out to prevent those who do not understand the performance principles of the machine at will.