Bobbins in one place? Spools in another?
Then this is the solution to the problem. Designed for the sewer that has the standard wooden thread rack.
Slide the hole side of the mini over the wooden post of the rack, drop your spool on it and then add your filled bobbin(s) to the other post.
Comes pre-assembled, ready to use. Should your post come loose, a tiny tiny drop of super glue and it will hold it in place.
How frustrating it is when you think you grabbed black thread when in reality it was navy. Been there, done that.