I use HiyaHiya interchangeables for magic loop all the time. The cables are thin and flexible but they get stuck in loopy positions - does that make sense? When they are all looped up, I find that a slow pass over the blower end of my blow dryer does the trick. I hold the dryer between my knees so I can hold both ends of the cable. I hold it taut and up against the dryer edges and slowly pull it across. This works great for loops but if you bend your cable too much for an extended period of time, you can make a kink in it that I haven’t been able to completely remove. I also experimented with soaking it in very hot water and that was a big mistake. It straightened it out but it also shrank the cable and made the cable thicker.