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ectoplasmosis
rcbprk
If you're planning on using a single sprocket on a cassette freehub, I hope you have better luck than I did. I noticed variable chain tension when rotating the cranks, and it was down to the sprocket not being mounted concentrically. I tried the trick with half-tight bolts and knocking the chain, but only got it slightly less eccentric. So I'm rebuilding around a proper fixed/free hub.
But this was a Miche cassette sprocket, not ideal anyway. Perhaps you're already intending to use a SS sprocket which is designed for the job?