Product review (5 stars): BE SURE TO BUY 4
I had one break and only bought 1, That one is much more efficient at absorbing the wiggles than the other 3.  Now I am buying 3 more to balance everything out.  I'm such a dufis sometimes...  Oh well.
!!!  --> At least they are easy to remove once you realize there are tiny little tabs that need to be pressed down on the front and rear of the plastic mounts.  Those little tabs lock the mount in place, and they are very efficient at locking!  So push a tiny flat screwdriver into the tab on the front side of the mount, then turn the mount, then move your screwdriver to the rear tab and turn it some more, then it should spin the 90 degrees and allow removal.