I only use them for burying the thread in the quilt. I sure do see how they might come unthreaded is you actually were using them to sew with.
Ellie: I am through the whole course. She really conveys a relaxed attitude towards the whole process and somehow gives you "permission" to feel the same. Really helped with her concept of "traveling" and using the ditch as an escape route. Well worth the time. I am having problems with breaking thread when I FM so will try the polyester thread as she recommended. Connecting threads carries a complete line that I may try.