Baby Lock Enlighten (BLE3ATW-2) Instruction and Reference Guide - Manual (Page 34)

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Returning to 3 or 4-Thread Overlock
1. Open the front cover and rotate the handwheel forward to
bring the upper looper to its highest position.
2. With your index finger or tweezers, move the subsidiary
looper slightly to the back to release from the eye of the
upper looper. Rotate it to the right until it snaps back into
place and out of the way.
3. Engage the threading lever to the threading position.
Rethread the upper looper (page 11). For 4-thread serging,
replace the second needle (page 48). Rethread the needle
(page 13). Engage the threading lever to the serging posi-
tion.
4. Close the front cover.
5. Lower the foot and sew a test stitch.