Originally Posted by Jclay85

Yeah, I believe I understand. Basically, I don't want the bearings to be pinched between the cups and the race on the shaft. In order to achieve the correct tension, I just back the cups in to the shaft right up to the point at which there's no lateral play. The outside notched ring nut keeps the cup from backing out. I do wonder why there's not a nut on both cups though?