always difficult to give one answer on thread breaking without seeing machine but check following:needleplate for damage where needle fitts thru,bobbin case for proper guiding of thread,hook spring for servicability(not damaged)thread guide above hook,lower and upper tension,upper tension unit take up spring.good hunting
johan
November 2012
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
