"Soft metal can be moved." This is a basic of machine work. The tools are hammers, punches and files. All of this tig welding and filing is only an expensive cure for a simple problem. Jack Rowe is not perfect, but he is mostly right. By the way, most shotgun parts are "soft metal" that can be moved with ease. To do things the "proper way" is very expensive and not neccesary for using shotguns.