This is a royal pain..probably the biggest one related to these kits, IMO. Sometimes they go on centered the first try, and others never seem to center. I can tell you I've had better luck with the 36t sprockets and the smaller diameter 44t sprockets. Perhaps smaller diameter sprockets are more forgiving...just a guess.

Just to rant...I HATE HAVING TO TWEEK THE SPROCKET.

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Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction.
- Albert Einstein