Baby Lock Eclipse DX (BLE1DX-2) Instruction and Reference Guide - Manual (Page 28)

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2-Thread Serging
Converting from 3-Thread to 2-Thread Serging
just above the threading port (fig.A) Raise the presser
foot and pull out the clipped thread from under the
foot. Remove the upper looper thread from the
Rotate the subsidiary looper up and to the left (fig.B)*
then slip the end into the upper looper eye (fig.C)*.
Close the front cover.
A.
B.
C.