One of the unidentified feet has two rollers on it, like rolling pin rollers, and have no clue as to their purpose. My sister guessed maybe for satin or velvet or another slippery fabric and I'm wondering if maybe I can use it like a walking foot. .[/quote]
I bought a roller foot and the card states that it should be used when shifting occurs because the top and the bottom are not being fed at the same rate: sounds like it'd be worth a try as a walking foot to me.
It goes on to say that corduroy, velvet, velveteen, stretch velour, stretch terry, synthetic suede and imitation leather are all fabrics that could benefit from the roller foot.
BTW, really cool Bernina and congrats on the 301!