I use one of these:
Costs a pretty penny but it always gets the job done over and over. I usually allow for negatives to get dusty in polyester sleeves, etc. so before enlarging I always pass a strip through the KSE and then into the carrier. I usually end up fighting dust on glass carriers more than negatives.
Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.