Right, it goes in the seal, the part of the axle that rides on the seal is larger. I found this picture that shows what I am talking about. The axle on the right you can see the splines then the shaft then a raised area that the seal rides on.So, is it actually inserting into the seal itself (because it seems like it would spread the seal too much?) or just acting as a guide to keep the shaft concentric to the seal?