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the only bearings that should be run dry are ceramic,all metal bearings have to be oiled otherwise you are running metal with metal with no lubrication,premature failure of the bearing will occur.
also,the bearing only appears to spin better off load,what do you think hapens to a bearing when its metal surfaces are rubbing against each other under load without oil..they actually create more drag than an oiled bearing,so please use a good quality thin oil,not wd40 as it evaporates eventually and leaves the bearing dry.
dave
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