Originally Posted by BoJangles

Sewbizgirl, have you changed your thread? Everyone now is using the new Bottom Line bobbin thread, which is a 60 weight - very fine thread. Some of the older machines can't tolerate that light weight of a thread. I have found with my treadles to keep the top and bottom thread the same. Even my Long Arm doesn't tolerate the really light weight bobbin thread - I spent several hours ripping out a quilted quilt due to the Bottom Line thread. I know these new threads are made for the bobbin, but be careful some machines won't tolerate them. Also, if you are using a really inexpensive thread, it may be the thread not your tension. The top tension should always be tighter then the bobbin tension. When you pick up your bobbin by the thread, it should only lift up on end not come off your hand unless you bounce it.

Nancy