Ok guys,
I found a knife that has the brass tube & inner pin that holds on the lanyard loop.
The knife is an old, pre-1941 Dwight Divine Ulster Scout.
As you can see it is a parts knife.
Notice in the second pic at the bottom you can see clearly that the tube is brass.
The tiny pin that goes through the center is non-magnetic, so I assume it is nickel silver & not stainless given the time in which it was made.
The tube is 3/32” (OD) and the pin is 3/64”.
There you have it. I would love to hear your thoughts on it and any experience you may have had working on them.
Dale