Article where the tendency of stainless steel seamers are becoming a more requested option  under the need of canners to further  reduce sanitary hazards , also highlighting the solutions put forward by a reduced group of seamer  manufacturers to solve the issues around down gauging and harder materials. The article focuses on three seamer manufactures and supports it with images of seamers manufactured by MCG. 

http://www.mcg.com.es/test/documentos/CM-03-14-046-049.pdf