All you need to do is space it slightly with a thin washer fast makes one, or you can go to your local hardware store and find one that fits the output shaft well and isn't to large. I personally also use the same thickness washer on the end of the output shaft, before the sprocket bolt and washer assembly. The washer on the end of the shaft needs to be she same thickness as the one behind the cs sprocket, and must fit inside the cs sprocket. If you don't use the small washer, the bolt could loosen itself. This might be over kill for some but I feel better doing it.