I had Sammy (@ MuuMuu101) make me a tiny gear on his 3D printer, maybe he could make you a 10ths gear? would have to send him a CAD file of it, but there are plenty of gears over at tinkercad.com. just look at other projects, find one that has the same tooth count and scale it to what yours would have been.
I guess I wasn't clear. I have plenty of extra gears, etc... its the inside of that tenths wheel that finally fails and of course its different from all others.