Harken MKII Roller Furling Drum With 3 Intact Extrusions - Hunter 31Harken MKII Roller Furling Drum With 3 Intact Extrusions. The drum is 7" diameter. The torque tube is 9" length. The first extrusion still in the drum is intact however it is slightly bent 21 1 2" long. 2 of the extrusions are 84" in length. And the other is 84 1 2" length. These are intact we cut so they could be riveted out and reconnected. Line needs to be replaced but it currently fits 3 8" line.