The internal tolerance on both the inner and outer flanges of the hub where the greaser and lubricator are to be mounted is too large. The oil shield (rear seal to spindle) should be tight, mine both were more like a loose fit. I doubt they will stay in place over time. The oiler (the one on the front) is plastic. But that's not the main problem. This cap should also fit snugly. In fact, they should usually be tapped with a hammer or rubber mallet. These fall off immediately. Anyway, these hubs are basically useless. They will likely be boxed and sent back. It's a pain as they are all lubed and mounted on the spindles. I think you get what you play for. By the way, this is not the fault of the seller, but of the manufacturer.
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