The stock gear is permanently pressed to the stock shaft, I don't think you can take them apart, so you will probably have to use the MH gear and auto hub. This will be better anyway, but costly.
I can't seem to get my LHS to get one for me, they seem to be having some kind of MicroHeli spasm or something.
And I love that gyro page. "Twindling" LEDs, indeed! and Suitable for high-class helicopters! Well, that's us for sure!