Hi John.
No doubt you'll find parts on eBay and maybe even some r/c forums. I used to own a couple of these many years ago and I literally beat the hell out of one of then. The gearbox never let me down.
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Vintage R/C nut. 
Reliving all the good old days of r/c from the 80's and early 90's.
-Jason
***always on the hunt for vintage KO ESC's***
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