I am in the process of installing new bearings in a 2 blade cub 38" deck. What I see is the height of new bearings must be under the size of the old and therefore when I tighten the blade nut I am pressing down on the cup washers to a point that the blade has significant drag, I assume the cup washers must rotate freely with the blades. I think I can solve the problem by utilizing a 3/4 washer which will extend each bearing slightly while just fitting the inner races. Think that is a good plan??