Originally Posted by
mmunchkins
I think that is the little button on the side of a certain presser foot that kind of shifts the balance of the foot backwards, so the foot will go over thicker pieces of fabric bunched together in multiple seams. You have to keep the button depressed the whole time with your finger. I might be wrong about this, though.
i have a thick plastic piece about 1.5” square. It’s called. “Jean a ma Jig” and it helps a presser foot get through a thick seam of many layers. A sewing notion I’ve had for years.