I removed the sprocket coupling and then replaced it. While trying to reinstall the rear tire it didnt fit. I noticed a sizable gap between the sprocket coupling and the wheel where the drive pins go in to the rubber dampers. I hit it with a mallet and closed the gap but there's still a bit of a gap. Should this be flush with no gap? If so what's the appropriate way to do this? See pics below.
(http://farm3.staticflickr.com/2882/9683336018_923b4e00b7_z.jpg) (https://www.flickr.com/photos/65036619@N04/9683336018/)
IMG_0109 (https://www.flickr.com/photos/65036619@N04/9683336018/#) by ricknieto (https://www.flickr.com/people/65036619@N04/), on Flickr
(http://farm6.staticflickr.com/5321/9680097799_271bc1f831_z.jpg) (https://www.flickr.com/photos/65036619@N04/9680097799/)
IMG_0111 (https://www.flickr.com/photos/65036619@N04/9680097799/#) by ricknieto (https://www.flickr.com/people/65036619@N04/), on Flickr
As long as your axle is square/aligned, and installed correctly don't fret.
I just replaced my rear sprocket and it looks the same. Slight gap. Just make sure your cush-drive bushings are in good shape.