Free Westinghouse rotary Greist attachment "5 stitch ruffler". Used collectable for Free machines only. The gap on Free machines is only 1/8" wide vs 3/16 for other rotaries (scan 3). It is also taller (higher shank) rotary foot. A bit dirty and minor pitting but usable. Works on your "Free" rotary machine or return for full refund.  $3 shipping.