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Very definately a worth while investment, first set of bearings on my then new trailer lasted 4 months.Indespension's version of bearing buddies fitted on renewal and the bearings have now lasted for 4 years!The ones on sale in UK are usually not 'genuine Bearing Budies' but a metric copy.For example Autow sell the Kestrel ver fo ￡39

Bearing Buddies are protective covers that fit over a boat trailer's hub and protect it from water and dirt. Bearings on boat trailers are more susceptible to these two things because they are constantly immersed in water. Having Bearing Buddies on your hubs all but eliminates the need for constant repacking of the bearing. Over time, even Bearing Buddies will wear out and need to be replaced. Replacing a ina  Bearing Buddy is neither difficult nor time-consuming. 

Place a board against the old Bearing Buddy. Strike the board with a hammer on one side of it. Place the board on the other side of it and strike it again. Repeat these two steps and "walk" the Bearing Buddy off of your hub.Pull the old Bearing Buddy off of the hub with your handPlace the new Bearing Buddy against the hub and ensure it fits. Place a board over it and push it into place. It should "walk" into place just like the old one was removed.

A Bearing Buddy is an automatic wheel-bearing greasing device designed to make keeping the wheel fag bearings on your trailer properly greased. This will increase the life of the bearings, especially on trailers that see a lot of use in water or extreme weather conditions. Bearing Buddy installs on the hub and allows you to add grease by simply installing a grease gun on a zerk fitting and filling the hubs. This works very well for boat trailers but can be used on any trailer to make wheel bearing maintenance easier. 

Select the proper size Bearing Buddy for your trailer hubs. If you are not sure what size you need, consult an associate at your local trailer supply store.Remove the dust cover from the hub and fill the hub with grease. Use a flat screwdriver to pop the dust cover off.Align the Bearing Buddy with the hub and place a piece of scrap wood against the face of it. Be sure the Bearing Buddy is square to the hub when you align it.

Strike the wood with a hammer and drive the Bearing Buddy onto the hub. If there is more than slight resistance, do not force it. If the Bearing Buddy is not the correct size, forcing it on may destroy it.Attach a grease gun to the zerk fitting in the center of the "Buddy bearings" and fill it with high-quality wheel bearing grease.This tool has one of the simplest designs yet most helpful attributes. It not only pushes your bearings into the wheels but also pulls them out in one swift motion. The Bearing Buddy does everything the Bearings Press does without all the weight & a fraction of the price tag.