This is possibly the dumbest question ever asked here, but is there a trick to installing the 19" aero inserts? I replaced my snow tires today with the OEM wheels and tires, but the aero inserts won't clip in properly. I had the silver hub disks and black valve stem covers installed when I first got the car and so have never had the inserts on the car. I have the valve stem opening in the correct place and the silver hub disk removed, but the inserts are loose and the center hub won't grip at all.