Differential Feed (Regular)

Differential Feed utilizes a two piece feeder below the plate that raises up through the plate,
compresses the fabric against the presser foot and then advances the fabric.
The front (main) feeder and rear feeder can be set to move the same or different distances.
When the rear feeder is set to move farther than the front, the fabric is stretched.
When the rear feeder is set to move less than the front, the fabric is gathered (shirring)