so that nobody uses my serial. because if their warranty ended they give my serial to traxxas and theyll send them a new part for free , but theyll be using my serial.
Traxxas will also accept the engine serial number stamped in the case. It's what I used. For once i was able to forsee the disappearance of the stuck on number as posted a few comments ago and went with the stamped metal. For me, that is a fairly huge victory.