I couldn’t resist this photo, especially with the naming of the bobbin “arc reactor.”
Having taught in various classes both in the community, for friends and at church, one of the dreaded experiences for a teacher is when student brings in a machine that either a) barely functions, or b) they have no idea how to make the thing sew. There’s a real temptation to stop the forward momentum of a class to help that person get their bobbin case untangled, or help the person figure out why the machine is eating their fabric. I’ve found, though, that it’s better to press on, so as not to shortchange the others who are there, and instead, send vibes of sympathy to the struggling sewer. A good machine–used or new–makes all the difference.