I went to a class on thread that was put on by Babylock. The rep said that invisible thread has to be rested. I put mine in the back of my machine in a small what use to be an ashtray, and then thread it through the machine. I have very little breakage this way. Also when it does break you should go at least a foot away from the break and cut that off, because the thread is damaged that far up. Hope this makes sense, because it does work.