what i'm looking to do is get some of the little metal figure 9s and attach them to my tarp lines. the thing is, i want them to hang down some, and be able to slide up and down the tarp line and yet hold tight when tension is applied(shug has this shown in the tarp section of his 10 part videos) kind of like how the whoopies work. so what is a good method of doing this? also, what is a good width of cord i should get, and how long do i need for each figure 9? my tarp lines are about 1/16th of an inch thick.