Output Shaft problem?

[maxthrottle]

I've noticed some play in the output shaft that connects to the small 15 tooth sprocket on my 400EX.
The shaft and sprocket has some play (In and out). It's not a lot 10-15 thousands maybe but you can definately feel it and hear it after I took off the sprocket.
I looked at another 400EX and the shaft is nice and tight, no play at all. Is this something that i should concern myself with? If so, what's the fix?

[Mxbubs]

Im almost 100% sure this is correct. I wouldnt worry. The thing is machined on each end with a step up that pushes against the inner race of a bearing on each side of each center case.