Studio, a/k/a Singer, a/k/a Silver Reed with punchcard capabilities did/does accept a ribber, but it would have to be matched to the main bed, that is, the right model ribber. Fortunately, you can still find such things through the magic of the Internet. ;-) If a person were so inclined, which I suspect you may not be. If you ran into a machine knitter in your neck of the woods, and were infected with her/his enthusiasm, it could happen....