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The documentation of the FN2 series overlock is lacking information. The handbook of a similar Singer product showing the different stitches and the thread tension may be of help. Click on the link to download this Singer handbook. HERE

 Elna overlock sewing machine handbook HERE

 Overlock stitches cheat sheet by SergerPepper.com LINK
Adjusting thread tension by SergerPepper.com LINK

Wikipedia article about Overlock LINK

The letter "B" on the model´s name stands for built in light.

Other manuals:
Manual Overlock series FN2 en español.
GK257B/357B Stretch Sewing Machine Manual - English.