The Viking 1+ and the Pfaff 2100 series have vertical bobbins. So does the 1500S.
The sidewinders may not work with the newer Pfaffs and Vikings that have drop-in bobbins although they do seem to work with older Babylock and Brother dropins, like the PC 6500 and the Ellure of the same vintage.
Some say that the name on the Pfaff bobbin needs to be on top. I've never noticed. The generic bobbins for the 2100 series aren't labelled and work just fine. The first Pfaff I had, the 1471, made no difference, neither did the 1475.
Last edited by Weezy Rider; 07-08-2013 at 06:05 AM.