Originally Posted by
Stitchnripper
If my machines have been running fine on either metal or plastic bobbins, right size of course, for years, is there something I should be aware of that I am not?
The way it was explained to me is, if the case the bobbin goes in is metal, then use a metal bobbin. If it is a drop in bobbin and the area it drops in is plastic, then use a plastic bobbin. Like to like.