LOL! Yeah, I can see how that one wouldn't work.
I just find that they seem to jump around a little more, and although I know it can't be true, in fact should be the opposite - it seems sometimes that they're louder. I seem to end up with a lot of cracked (older) ones too.
I was once told by an OSMG that if the case is plastic, use a plastic bobbin. If it's a metal bobbin case, use metal.
I was also told by another one that he only used plastic, because the metal ones could get magnetized and mess with tension and your mind as a result. I drop my bobbins enough, I don't think they can keep any magnetization they might develop.
Just call me "fumble".