I recently bought a 16 ft Alumacraft boat and galvanized Shoreland'r trailer. Since I use my boat in saltwater, I like grease the wheel bearings after every use. It has serviceable hubs but not the kind I am used to (Bearing Buddies). These hubs are smaller and clear plastic with a zirc fitting on the end. There is a black ring and a red ring inside. There are also holes that appear to be to prevent over filling. The only problem is, no matter how little grease I add, it comes out the holes and gets flung all over. What do I do?