A metal crimp/grommet is attached to the top of the string ladders. This metal crimp/grommet is inserted into the opening on the top of the tape roll. This opening narrows to hold the crimp/grommet securely in place.
To release the ladder from the tape roll, move the crimp/grommet to the wider opening and remove.
The crimp/grommet can then be moved or you can adjust the position by tying a knot in the ladder. Additional crimps/grommets are available and can also be used to adjust the position.
Insert the crimp/grommet or knot into the opening on the top of the tape roll and move to the narrow opening to secure in place.