So, in the process of replacing the rear drive chain on this 453-F, I removed the bolt holding the sprocket onto the splned shaft and drove the axle outwards with a hammer. I figured this was the best way to gain clearance for the chain to slide over the sprocket. Seemed pretty easy at first, but now I am having trouble getting the axle to slide back into the sprocket. I can find no better access than the cover on top of the chain case in the front. With only one hand working by feel and a helper tapping the shaft inwards I gain nothing. Is there a better way? Did I make a huge mistake by pulling the axle? Any help or suggestions are greatly appreciated!