Thread continually wraps around bobbin seat mechanism and tightens up until it can no longer move. The entire bobbin holder is loose and gets shifted around. This happens at random times, but when it begins to happen, it is very difficult to get it going normally again. This seems to be a recurring problem with this machine. What is the solution?
You need to follow the steps from user manual Singer inspiration 4210 manual Download Free Manuals
It sounds like you need a new bobbin case. and it would be a good idea to have the machine serviced
SOURCE: Upper thread wraps around bobbin mechanism, while sewing
IT PROBABLY IS THREADED INCORRECTLY. GO SLOWLY BY THE DIAPHRAGM AND MAKE SURE IT IS THREADED CORRECTLY. ALSO MAKE SURE SPOOL PIN HOLDERS ARE IN PLACE THAT HELPS TO GUIDE THE THREAD CORRECTLY.
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