There ARE different kinds and sizes of setons out there, ranging from surgical thread to larger plastic.
You may almost have to turn it, now and again, to keep it from getting "stuck" in its tract. Eventually the tract should scar with the seton in, if you ever get another one.
I've never been to CC. I just know for me, 2 surgeons from 2 different hospitals (one my original surgeon) said that for me, surgery wouldn't be a great option because of the sphincter thing. So I deal and live with a seton, too.