Singer 760 Manual !!link!!

You might think, “It’s just a sewing machine; how hard can it be?” The Singer 760 is unique. Unlike modern machines with top-loading bobbins, the 760 uses a system. If you thread it incorrectly or place the bobbin case wrong, the machine will jam instantly.

This was a standout feature designed to let you wind the bobbin while it was still inside the machine. Stitch Selection: singer 760 manual

Do not buy "Class 15" bobbins; the manual clearly specifies Class 66 for the Touch & Sew series. You might think, “It’s just a sewing machine;