If you think there is a thread caught up in the case, of course you can take it out and see if you can remove, if you feel uncomfortable, take your time, get a piece of paper and draw exactly how the case and bobbin look . That way you can figure out how to work on it. If you are a new sewer, take time to go to google and search for how to, topics like threading, cleaning,stitches, most any question is handled by many machine companies, if you still have trouble, write another post, but put the name of the machine, and if it is old or new, someone will probably have one like it, or know how to help, enjoy, don't get nervous Rene