The Genesis pinions should thread onto the m12 portion of the 2 speed CEN bells.
With the Ofna m10 pinions and the Genesis m12 pinions you should be able to come up with a varied assortment of gear ratios using the FF's clutch bell.

1st and 2nd gear on the Genesis bells use the same thread. You might have to thin them down abit.

Thanks for the info on the Ofna Hyper 10 pinions.


rolland