Hi, any advice on putting them on? Have a 2002 Karavan trailer. One of the silver metal caps on the hub fell off, so I thought might as well put on a bearing buddy. However, the depth of the bearing buddy seems too shallow as the grease fitting on the hub is hitting the inside of the bearing buddy. Instruction says to hit the bearing buddy with rubber hammer. Hit it pretty hard and it didn't go in. Diameter of the bearing buddy seems correct. Thanks for your idea.