ELNA 664 Pro - Thread Guide and Looper Tension Lever; Changeable Thread Guide; Lower Looper Pre-Tension Setting Lever

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Lower Looper Pre-Tension Setting Lever
Standard serging (ST)
Push down the lever for standard serging with 2, 3 or
4 threads
Lower looper pre-tension setting lever
Rolled hemming (RH)
Push up the lever for rolled hemming with 2 or 3
threads.
Changeable Thread Guide
3/4 thread serging
Push up the guide for serging with 3 or 4 threads.
Changeable thread guide
2 thread serging
Push down the guide for serging with 2 threads.
3/4
2
3/4
2
2
1
2
1