Originally Posted by Candace
I find this thread curious as I've been told by vintage machine folks that the plastic bobbins are a no-no!
That may be because some of the plastic ones are shaped differently and this can cause them to "jump around" in the casing which could lead to thread jamming which can affect the tension and/or the timing if not caught in time. Also, the plastic bobbins do wear down in the metal casing eventually and that can also cause a problem. I think a lot of the time we say NO because that's the way it's always been, but that doesn't mean that's the way it has to stay.