When I bought my boat and trailer last year (my first) the trailer already had Bearing Buddies on it and the guy I bought it from told me to shoot a couple shots of grease in the hub whenever I pulled it out of the lake to force any water out. I haven't done this everytime but my hubs sling grease on the back side of the wheels too. If I have to replace the Bearing Buddies, how do they come out? I'm new to all this too. Thanks.