I am sewing on a 730 Bernina and believe I need to adjust the bobbin tension. There are two screws on my bobbin case; a small one and a larger one, which one would I adjust. The reason I think this is the problem; as I sew the bobbin thread pulls up on the right side of the fabric causing me to be able to literally pull the top thread out as tho I was basting something.

Terrie, November 2009

Hello Terrie,
You adjust the large screw, only turn the screw a quarter of a turn at a time clockwise to tighten then test sew, you should just be able to pull the thread through with slight resistence, make sure the bobbin turns anti clockwise

drivewithken, November 2009