I've just bought the bobbin case that Janome sell for free motion quilting. Until now FMQ has been almost impossible on my 4800 because of loops on the bottom at every tension setting except (sometimes) 9. I'd be interested to hear from anyone else using this bobbin case just how much difference it made to the tension you used - what number works? Obviously it will vary from one quilt to another, depending on thread, needle etc, but any indication of whereabouts on the tension dial I might be aiming for could save me a lot of time and frustration!