I just got mine today and while trying to put the plastic muzzle on the camera, three of the vibration grommets popped out (one popped out completely, prompting 15 minutes of digging through grass looking for it). I guess I didn't have the latch pressed all the way before trying to pull the camera off.
I was able to get the grommets back in (unfortunately before I read the suggestion above to use floss, but I got them in with a nail file). What I realized by watching some YouTube videos is that there is supposed to be at least two plastic retainer clips keeping the rail from pulling off the gimbal base. Mine only had one retainer clip (that one did not come loose, which probably saved me from having to repair the wires underneath). Mine was a "refurbished" unit, so maybe the missing retainer clip was just missed by the refurbisher.