Hi. What I found works best for me to hold the tdcs electrodes in place are the rubber wide bands that I have received from my PT. They are long, about 3" wide and I only need to wrap them around my head once and knot in the back. Because of how wide they are, I can fit the one sponge over my eye and the one over my ear. Also, it doesn't pull my hair like the other options do and they are easily reusable.

Hope tdcs works for you.