A module cutterbar assembly includes a plurality of modules coupled to one another along a joint. Each module has a first surface defining a first plane and an internal cavity. A drive transfer mechanism is disposed within the internal cavity of each of the plurality of modules, and a drive hub assembly is mechanically coupled to the drive transfer mechanism and extends out of the internal cavity away from the first plane. A cutting disk is coupled to the drive hub of each of the plurality of modules. A coupling mount is positioned on each side of each joint and extends from the first plane towards the cutting disk. A cavity is partially defined by the first plane, the cutting disk, and the drive hub in each module. The coupling mount is disposed at least partially within the cavity.
