These gadgets have been included in many tarps and tents for years but I have always discarded them and replaced them with something else. I decided to dig some out and give them a try. The first picture shows the item I am referring to - the second picture shows how I am using it on a tarp tie-out line. The 'slider' can be moved anywhere along the line and the tag end can be adjusted where it is 'pinched down' in the slider. It actually seems to work pretty well. It is light, compact, easy to adjust, and seems to hold good. But I suspect that I am not using it as it is designed. Does anyone know how these are supposed to function?