I can adjust the bobbin tension on my Bernina bobbin case by turning the tiny screw. Take a picture of the bobbin case and screw position before turning it so you move it back for regular sewing or if it doesn’t help with FMQing.
p.s. Make sure you are turning the screw tiny bits at a time and don’t turn it so far that the screw comes out and you lose it.
Last edited by Tartan; 03-13-2019 at 06:47 PM.