FWIW, be sure to RAISE the presser foot when threading, and thread each thread in the proper order (usually the upper looper first, lower looper second, etc.) and confirm the thread path for each thread. Give each thread an extra little tug when going through the tension disk to make sure it is seated all the way.
Start out with the tension disks set at the midway point between high & low numbers. This is the standard setting for an overlock stitch, however, each machine may need a bit of tweaking to get the stitch right.
If a thread breaks, it's usually because it has been threaded incorrectly.
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FWIW, be sure to RAISE the presser foot when threading, and thread each thread in the proper order (usually the upper looper first, lower looper second, etc.) and confirm the thread path for each thread. Give each thread an extra little tug when going through the tension disk to make sure it is seated all the way.
Start out with the tension disks set at the midway point between high & low numbers. This is the standard setting for an overlock stitch, however, each machine may need a bit of tweaking to get the stitch right.
If a thread breaks, it's usually because it has been threaded incorrectly.
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