Someone on this board (sorry I can't remember the name) posted a tip about putting reinforcements on top of her bobbins to stop the thread from unraveling. Well, I used that wonderful tip and took it one step further. I have multiple machines that use clear bobbins but they are not the same size. Try as I might, I am never successful in keeping them separated. Now I just write which machine the bobbin is for on the reinforcement and also which type of thread is on the bobbin (Aurifil, Isacord, etc)!