Originally Posted by
Nilla
... I've only used King Tut thread since that's what my dealer recommends. If I'm about to get rid of it anyway, maybe I should try a different thread. Is there a particular brand that's best?...
King Tut is a lovely thread and comes in luscious colors. It is cotton, however, and it will produce lint. The lint can build up in the tension discs causing the tension to go flooey (technical term). The same thing can happen in the bobbin. Fluff builds up in the tension spring. In either case you could be sewing along just fine with great tension, and due to lint build up, your tension goes south. Before throwing in the towel, I would try a poly. Superior bottom line is a good choice, it is thinner than King Tut. FilTec Glide is another choice. It's poly and the same weight as King Tut.
Here is a great video on how to set your tension:
https://www.youtube.com/watch?v=Q1mRhcquZTM