Ferrule
The joint where two sections of a multi-piece rod fit together, either a spigot plug or a sleeve over the lower section.
A two-piece rod has one ferrule, a four-piece has three, and a telescopic rod has one at every collapse point. The two common designs are a spigot, where a solid plug on the lower section slides into the hollow upper one, and a sleeve or tip-over-butt, where the upper section fits over a narrowed shoulder on the lower.
A well made ferrule is close to invisible in the bend. A poor one creates a stiff spot the blank has to work around, which is where the old complaint that multi-piece rods feel dead comes from. Modern four-piece travel rods are good enough that most anglers cannot pick them out blind.
They also work loose. Line twist, casting and a fighting fish all rotate the sections slightly, and a ferrule that has crept apart is the usual reason a rod separates mid-cast and launches its top half into the lake.
Push the sections together with a slight twist, and line the guides up by eye down the length of the rod before you tighten. Re-seat them every hour of fishing.
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