Originally Posted by
pballer2777
a fellow driver told me he thinks its the collars itself. more so the groove that the oring sits in, that it machined deeper than the fronts. now I know this sound crazy since its the same part # as the fronts, but maybe the rears are from a different batch than the fronts. I didn't have a chance to do this yet but I'm goin to take one off the front and try it on the rear. if it fits snug then its the collar. also what this same person did was take a set from his .3 and they fit snug.
From what we can tell this is the case. A batch of collars seems to have the o-ring groove cut a little too deep. For a quick fix to get up and running, I suggest running the loose ones in the front as the springs are always in contact with the collars, that little bit of pressure will help the collars not move very much during running. I know others have found larger o-rings, double nutted the collar with a plastic one, or happened to have an old collar that they used. For a permanent solution please contact customer service and they'll get you sorted out.