Report "Hello, I have an older Juki serger and it's great! BUT, lately I have been getting loops of thread on the underside, especially when serging thicker things, like sweaters. I have serged plenty of sweaters in the past without this looping problem. I have tried adjusting tension dials but it doesn't seem to help Also, it seems like the yellow, or 2nd needle isn't stitching properly. I have already made sure the threads are seated well. Any ideas? Thanks!!!"