Re: Allen rods - ferrells?
The idea behind spigot ferrules is to help lessen the effect of "hinge" in multi-peice glass rods. It also allows for a continuous taper where as in tip over butt the tip section sees an obvious swell towards the ferrule. The gap in fit is because the male end of the ferrule flexes along with the rod during casting and fighting fish, the two female rod blank ends would grind together with a tight fit causing splits and weak spots.
Oh I live to be the ruler of life not a slave