BERNINA #12C 9 mm Bulky Overlock Foot | B 570 QE, B 790 & More | #0088787500 Guide Foot fabric advancement turns erratic --

fabric advancement turns erratic -- producing puckered seams

or embroidery

Newer 9960 production uses a different holder

Janome: Janome Horizon 9480QCP SE

BERNINA #12C 9 mm Bulky Overlock Foot | B 570 QE, B 790 & More | #0088787500 Guide Foot fabric advancement turns erratic --Sew overlock style seams in bulky knits and guide uneven layers more smoothly with BERNINA Bulky Overlock Foot #12C. Its wide sole groove also accommodates thick cords and covered piping. A guide hole supports couching with yarn, narrow cord or leather strips, while the open space beneath the foot helps when attaching bead strings and sequins. Piping can be formed and sewn into a project in one operation. Published fitment includes compatible new