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[Charlie B]

I thought I should provide some part numbers for this. The original wheel/axle gear set is Atlas part number 807301. The gear I found that will work to replace it is Atlas part Number 807313.  It has to be pressed onto the shaft in the exact position because it is slightly wider where it fits the shaft. The axle also fits other Atlas models so the gear should work there too.  The broken axle gear had cause the double drive gear (807311)to break too but it is still available.
Charlie