Janome MyLock FA4 SergerThe FA4 with electronic foot control is an advanced overlocker with 2 needles and 2, 3 or 4 thread overlock stitching. The differential feed ratio, which is adjustable from 0. 5 to 2. 25 provides exceptional control for handling all types of fabrics and for creating desired special effects. Color coded thread guides help with machine threading. The guide is automatically returned to its normal position when you turn the balance wheel. The thread