This is my first delivery and of the five bearings I've used so far all work perfectly. The ones I received were sent completely dry - no rust oil, no grease; Therefore, some of the balls are more likely to fall out when dry mounted on the bars. The ball tracks must be filled with lithium-based grease. And the lube needs to be pushed into the tracks, not just smeared or squirted onto the surface. This is easily accomplished by squeezing a drop of lube into the canal and then carefully inserting a stick into both ends and slowly squeezing the sticks together. Repeat this until grease begins to flow from both ends of the bearing, indicating the raceways are full. Hope that helps. steve
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