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Bobbin thread breaking

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Pretty basic, but do you have the bobbin in properly?  It might be backwards.  I can't think of a time when I had bobbin thread breakage.  If the bobbin is in right and properly seated you might check for burrs on your needle plate.  One more thing to check is your bobbin case backlash spring.  Is it in place, and working properly?  Good luck.  Jim

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Thank you, Jim.  Yes, bobbin is in correctly but I am grateful for any comments and suggestion.  Had a needle come loose and I think it damaged the bobbin assembly somewhere.  I've taken it apart and smoothed burrs but still have the problem of breaking bobbin thread.  I find it very unusual and frustrating.  I've ordered a whole new assembly from APQS.  Should arrive tomorrow.  Hopefully this will fix the problem.

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