This morning I was awake early, full of enthusiasm, wanting to get to quilting the Christmas Tree Skirt, but my normally dependable machine would NOT cooperate. Thread nests, pokeys, snarls, threads not laying flat on top. And I had put in very good, expensive thread, both top and bottom. Changed threads, re-threaded, changed feet, and nada, nada -- even tried a second new needle. Then I got out a flashlight and looked as well as possible into the tension area. I could not discover any method to remove the cover OFF to look closer, but I DID see just a bit of extra threads in there. Sure enough, with my tiny tweezers, I pulled it out -- a small fuzzy, knotty wad of thread. Voila - problem resolved.
I always have the feeling there is still a small bit of invisible thread in there. Anyone know how to remove the cover from the tension disks, on a Janome MC6500?