... easy to operate without electric power or pneumatic power.Ours spring balancer developed on the basis of international advanced technique, ... core part of spring balancer----coil spring from Korea(B&F engineering co,ltd,d·metal co,ltd ). All coil spring can bear 60 ... CHERY AUTOMOBILE CO.,LTD., CHINA NISSAN,CHINA FOTON, etc.Spring balancers together with ours spot welding transformer, spot welding guns ...