cogs

Hi, I have the Skyhawk for my Son. Thing is, after several crashes the gears have worn out the teeth. I don't know much about them apart from how to replace them, only thing is I cannot find where to buy them as they are not made anymore and tzumi messaged me to say they cannot help. Would be...

Does anyone know if it is possible to replace the pinion (small plastic cog) on the end of the motor spindle, or does the whole motor have to be replaced?