I was at a fellow quilter's home this afternoon, looking at her quilts. She mentioned her 'treasure', and asked if I would like to see it. Well, hidden in a beautiful parlor cabinet was a Duplex treadle! (She showed me the bobbin and bobbin case; so different! The case was bullet-shaped. I am guessing it is what everyone has called a vibrating shuttle.) It is the machine she learned to sew on - belonged to her grandmother, I believe. It still works. Sorry I can't post pics. I thought it would be rather rude to ask if I could take pictures. Sure was fun to see, though.