means known in the art for attaching a line to a structure which may include but is not limited to tying as depicted in fig2 likewise snap swivels or other means for attaching line 105 to line attachment loop structure 104 may be utilized line attachment loop 104 may be rotatably attached to a surface of gripping hook 102 for example by pivot pin 103 thus line attachment loop may be free to rotate about an axis formed by pivot pin 103 on an axis of rotation pivot pin 103 may be secured to a surface of gripping hook 102 by any means known in the art such as for example and not by way of limitation swaging fitting or by use of matching male and female threads in which pin 103 may comprise male threads which match female threads disposed in a surface of gripping hook 102 pin 103 is attached to a surface of gripping 102 so as to allow a rotating engagement between line attachment loop 104 and gripping hook 102 in the directions of arrows e as shown in the figure thus a line such as a chalk line 105 may be attached to line attachment loop 104 and.