I love King Tut, but my machine hates it. So, I just don't use it any more. Glide, So Fine (all 3 types), Omni, Lava, Magnifico, Fantastico.........all fun to use. I recently used WonderFil on a whole quilt and it worked like invisible thread. I also had some WonderFill prewound bobbins that worked well. King Tut, Rainbows and Highlights just don't work for me, but there are so many other choices that I don't mind. Glide is probably my favorite. I also use the Magna Glide Classic prewound bobbins and the Magna Glide Deluxe from time to time. The other day I used some Super Bobs prewounds and they worked great too. It's funny how so many of us can have the exact machine, but some threads work and some don't. I tried everything with King Tut.........tension adjustments, Sewer's Aid............nothing worked.