We now have the optional higher tension embroidery only bobbin cases for Bernette B79 Sewing and Embroidery Machines. It is the same bobbin case that comes standard with B70 Embroidery Only machines. 
b70 DECO + b77 + b79 Tutorial – bobbin winding and threading playlist (1/11)
Amy B, Happy Valley OR
Very easy to navigate website with a huge selection of products.