A Customer asked me to remove the barrel mounted sling swivel from his Ithica Model 37 Deerslayer. This shotgun is the new type with solid frame non removable barrel. I'm wondering if anyone has experience with this firearm? This sling mount is a separate piece but I can't figure out how it is fastened to the barrel, I see no soft solder or siver solder line at the junction. Does any one know anything about this problem? Thanks in advance.