The Bernina Jumbo Bobbincase 710 750QE 780 is designed to be used in the older 7 Series models. The tension on this bobbincase is set slightly differently. Although this bobbincase will fit the modern 4,5 & 7 series Berninas, it will create a poor stitch. The two types of standard Bernina Jumbo bobbincases look almost exactly the same. So there is the chance of confusion. This Bernina Jumbo Bobbincase is designed to be used in models, 710 750QE 780 How do I tell the Bernina Jumbo Bobbincases apart? The Jumbo bobbincase designed for the modern 4, 5 and 7 series has a Triangle stamped on its side. The Jumbo bobbincase designed for the older 7 series has no Triangle stamp. I’ve included a side photo of each bobbincase in our listings to illustrate the point.
