Bernina 440QE
My Bernina dealer told me she didn't think I could get consistent stitches usinging King Tut 40/3 in the top and bobbin. She recommended if I wanted to try it I should buy another bobbin case. ($60). Because, she said, I should never touch the original factory bobbin case setting. Does anyone have experience with this? Is she just trying to sell bobbin cases? I'd like to believe that is not the case.