this technique I believe originated in the UK. Where ferruled leaders first started. They tie on a solid ss ring then tie on the tippet section. the ring is the same as when you order a ferruled leader, about 1mm in size. Here in the NW we use barrel swivels as they have the added benefit of reducing line twist. You can get them in a sz 24 now. about 4-5mm in size.
Anadromous FLY
Please practice catch and release.
Tony MO
916-897-0321