Causes:
Running the chain WAY too tight sometime in it's life.
Using cheap, crappy sprockets that don't fit snuggly is the main culpret in my experience.
Also people not locking the sprocket properly with the nut/tab etc and letting it drift on the spline.
The ONLY thing you can do is replace the shaft or weld a new sprocket on until you have the parts/cash/time to do the replacement.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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