I understand your problem. I have two machines a 6 yr. old Viking with a drop in bobbin and a over 20 yr old Pfaff with a front load bobbin both of which I bought new. Lately I have been having some trouble getting the feed dogs up on the viking after free motion quilting so have also been using the Pfaff for a lot of my piecing. I was cleaning the VIking and searched and searched for the bobbin case. I couldn't imagine how it could disappear when I had not moved from my sewing table. After much searching and frustration I realized that the bobbin case I was lookin for belong to the Pfaff not the viking.