Several of them were fitted onto modified Fallkniven Blades - that took a ton of grinding & fitting. I also set the tangs in epoxy - not so much as a bonding agent, but to fill gaps. I then slipped the brass tube thru the butt end of the handle (the holes line up on the tang of an S1 blade - I had to drill the tang on the Taiga Forrester) & flared them on both sides. Done.
I am about to rehandle an old Master Hunter with my last handle. That's a much simpler job - drill out the brass tube, punch it out and slide the old handle off. Then reverse the process & you're done - CS did not glue the tangs on the knives I've worked on. I will, however, put a thin layer of epoxy on the tang as a rust preventative since it is Carbon V.