As I posted previously I have a 3 week old Janome 6600! It was an expensive purchase my husband made for me and way over our budget!!!!! I have been trying to topstitch a denim rag quilt with Wonderfil Accent thread on top and Guiterman cotton in the bobbin as per the dealers recommendation. The thread keeps shredding and breaking and I have rethreaded-changed needles-changed bobbins-cleaned out lint all to no avail. I even resorted to turning the needle manually over the seams. Took it back to the dealer with my thread and fabric sample and she stitched on it with no problem. She said my thread was not feeding properly so I bought a net and returned home. Tried to stitch a block and same problem happened.I threaded my old Kenmoe and it worked fine..Back I went they had the machine for a week called and said they made a minor adjustment and that they had all stitched on it with no problem! Dumbo that I am ( I should have tested it out again in the store but didn't) Came home and it worked ok for 1 block but then Darn crap the thread is still breaking!!!!! At this moment I am feeling heartsick! I am sure they think I am nuts and I feel stupid calling them again. It was so expensive and I do not know what to do now!...Val