Baby Lock Diana (BL480A) Instruction and Reference Guide - Manual (Page 37)

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Depending on the needle positions used, this machine can sew 2-thread and 3-thread standard width 4 mm
overedge and a 6 mm wide overedge seams.
Also, for overedging heavyweight fabrics, the seam width can be increased still more by turning the overedge
seam width adjustment dial. (See page 29)
6.0 mm
Overedge left needle
Red
tension dial
Overedge width 4.0 mm
Needle used Overedge right needle
Needle thread
Yellow