Quilting D, I have a Bernina 153 QE and I just checked the lever. It wiggles!!! Whether it is in the up position or the down position, it wiggles back and forth (horizontally) a bit. If you ever find out if this is normal or not, please post your findings so the rest of us (or at least me) will know.
PS: I just checked my older Pfaff too and it's lever wiggles also! Maybe I am too rough when putting the lever up and down? Hmmmmmmm.