I just read through this thread again and there's some definite confusion on the different kinds of ferrules....not even counting the metal ones
1) This is a spigot ferrule. A full length blank is cut and a solid fiberglass plug is glued to the interior of one end.
2) The tip over butt is what what's seen most often on modern fly rods.
Each section of the rod blank is rolled on it's own mandrel and then the separate pieces are mated together
3) Some rods, like the Eagle Claw Featherlight have a butt over tip ferrule
It makes for a mismatch of a soft tip and heavy butt
4) And just to confuse things even more there's also a sleeve ferrule with a fiberglass cylinder that's glued on over the blank