Twice I've bought these and twice all had cages interfering with the races to prevent friction free running. I still use them to repair low rpm medical equipment but I'm surprised Quality control at the factory cant see they have a substantial amount of friction! Excellent value otherwise, will continue to use.
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excellent product for model railroading
February 19, 2012
Bernd from Rochester New York
Very useful in model railroading drive units. Cuts down on friction. Better than friction berings.