Hello, quilter1963. Did you ever work out your tension problems? I just joined this board and have a KenQuilt 633 which I bought used about 2 years ago. It's the same machine as the 622 but with a slighter bigger throat. I've had my share of problems and have worked through most of them on my own as I have no shop locally. I would love to compare notes, it see if I could be of any help and maybe pick up a few new pointers.
Jeannie