Hers had a crank as well, but the issue was this set screw in the back. Despite lock-tite and making sure it was tightened to spec, and checking it constantly, it still managed to vibrate itself off completely or at least off enough that the plate turned and it came off the bar, at various points while riding.No, Mine had a little crank to tighten them, once tight you fold the handle back in to lock in position .It was a pit of a pain to line the back plate up with the curved bar..
A couple of times off-road, once on the street. She would find the crank assembly inside the pannier where it dropped in. Usually, she could find the plate. Not always the set screw. Didn't seem like the best way to mount, putting all that weight (Jesse's are crazy heavy) on that little set screw. Dunno, never owned a set of Jesse's myself.