terrible grinding sound

[ReV:-O]

well, the 17T pinion FINALLY arrived, after weeks of waiting. As BrianG mentioned on the first page, i expected the pinion to be the same shape teeth as a clutch bell as it says in the description that it is meant for 1/8 brushless conversions. However, its EXACTLY the same as the 14T i already have! i put it in and the grinding noise is still as bad. For some reason, its seems a little quieter going in reverse than it does forward...

here are some pics:





Does anyone know where i can actually find some pinions that have the teeth shaped like a clutch-bells'?

thanks alot