Originally Posted by
quiltingbuddy
I used King Tut on both top and bottom with a 90/14 topstitch needle as instructed at my Bernina Dealer before they left. I guess that does make a difference but I think I've had this issue before with Aurafil also.
Use King Tut on top, with a 90/14 top stitch needle and use Bottom Line in the bobbin. Using King Tut top and bobbin is way too heavy for the machine to work with.