I'm wracking my brain trying to figure out where they got those swivels? It's a barrel swivel's body, but they tapped it and removed the top and bottom portions of the swivel. So they just had the barrel.
When they tapped it that created a place for the through wire to go through the center of the barrel. But here's the kicker, before through wiring, they slipped a length of wire out of the bottom where the hook holding swivel went, this wire was peened the same as the lower portion of the swivels head, they then created a loop, slid the hook on, they then wrapped the hook hanger. They then pused it into place and ran the through wire...
DAYYYum!

Anyone have a source for these?? I know highly unlikely, I can tap the barrels myself, but any idea how I can peen the top of the wire I would then insert to create the hanger? Trying to stay to specs on these bad boys

But I had nightmares of hooks popping right off the swivels

oke: