That is an odd bobbin configuration.
It may provide some context to explain that my machine was inherited from my mum — it’s a 1969 Singer Fashion Mate, which I believe is either the model or the ancestor of the model for the following diagram:
Today I discovered the reason it always takes like 20 tries to get the Arc Reactor to thread properly is that the Uppydowny has to be all the way up up and the Flux Capacitor has to be all the way down before you insert the Astromech Droid into the Cryhole. If it’s in any other configuration, the Arc Reactor jams.
Oh man that was really satisfying to say.
You can always spot which Tumblr users migrated over here from LiveJournal because we consistently call the Read More button ‘the cut’.