Back in 1980 I bought a Navy Arms Henry ... no sling attachment
at the time Dixie Gun Works had original (NOS) swivel & stirrup.... I think the pair were under $12 shipped
I had them installed on that Henry (left side) , sold the gun in 88 and bought it back in 09 from the same fellow.
I had used and abused it on Horse Back reenacting , he on the other hand stuck it in his safe ( call it a time capsule )
having never shot it....
Just a little "oh by the way" speed bump in the topic