It's moving around when I try to sew, but it won't let the thread go around it, so then the thread just keeps looping around the case.
SOURCE: bobbin bunches up
Classic burr on the hook problem would be my first guess. If the thread remains on the hook when it makes the next revolution all sorts of ugly things happen such as you described. I made a video that might help.
This sounds more like the motor is bound up. The other solutions are, check for thread wrapped around moving parts, any belts that may have become displaced.
Testimonial: "Thank you I took the casing off and although I could not see any obvious threads I cleared out and blew into machine and put it back together and hey presto I am happy it worked.. So I reckon you are right with something bunging up the motor. Whatever it was I loosened it. Thanks"
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