Axis has introduced a carbon mast to its mast lineup in 2020. This means that they had to redesign the fuselage and consequently this "doodad" is required if you have the original 19mm alloy mast or the new slim 16mm alloy mast.
The "doodad" is essentially a removable spigot, replacing the earlier version. The "doodad" is not required at all if you choose to run only carbon masts.
Doodad is the secret weapon that provides industry-leading rigidity between mast, fuselage and foil. Compared with other brands you’ll feel the difference immediately! Both the Black and Red fuselages can be fitted to all our aluminum masts.
Machined to provide equal stiffness as the original, but with substantial weight savings.