My babylcok eclipse is set up for 4 threads, the left needle thread is looping under the fabric, while the right needle thread is not catching in the stitch and there is no overlock forming. I have set th tensions to 0 and made sure they were free of obstruction before resetting them to 4. I have rethreaded the machine several times, have made sure the differential is set to N, and I cannot get this thing to serge a seam. I was able to get it to serge about 3 inches and then it went back to the same mess. HELP
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