I just got my Inspire 2 and when I started to mount the propeller I observed that the rear red one has a small movement while the others are OK. After doing some research I found the rattle problem with the red one. I got 4 red propellers with my Inspire 2 and all are OK in front and bad in rear. They don't rattle like you see in different videos just have a small play.
                     I have the revised type of propeller with foam insert and the new mount. The propeller are OK the mount is bad. How I know??? First of all in front is OK. After I put 2 layers of duct tape is not moving and stays perfectly. However is my intension to ask DJI to send me another mount free of charge - even if I get 2 spares with Inspire - because at this pornographic price I want everything perfect. Here is the fix if you have the problem... use 1, 2, 3 layers depend how thick the duct tape is.

If you either call 818-235-0789 or email support.us@dji.com, they would be able to help you out with getting replacements.