On my terrova, the us2 cable comes out of the head right at the coiled up cable and runs down thru the coiled cable and out of it right at the end where it goes into the base. I have at least 6 feet of us2 cable at that point, plenty to coil 8 times in the ring. There is no need to take the cap off the top, there was no slack in mine when I took it off the other day. The adapter cable is only about 14-16 inches long, not to be used to coil anyway..