Spacer
I found out that an internal spacer was notninstalled in the hub. It goes between the hub and the rear wheel. One end is smaller in diameter than the otjer and it was missing from the hun that failed.
The guy who replaced the sproket was not working from abook and in a shop that was littered with parts from other bikes. If it dropped then he had nonway of knowing without looking at an IPC drawing or exploded viewnof the rear hub assembly. Glad it did not result in a 70 mpg skid.
Pressure anyone into "Open book" policy when working on your bike.  y    
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