Mine rattles on both sides as well. I LOVE Leatherman, but I have to say that the Supertool lock leaves much to be desired. It's nearly as bad as the lock used by Bear/MGC (the lever that sticks out away from the folded tools). I actually like the older ST method better (that is, unfolding one tool to unlock another). When compared to the SOG or Swisstool locks, you really find out how lacking the Leatherman lock is.