Talking to people like peter moss (pro racing) and others, there seems to be a few small design errors, none of which from my understanding cant be overcome.
The main problem is, from what I've learnt, the shaft/spur moving away from the motor under (can be greatly reduced with an extra ballrace), and the spur material and tooth profile.
Ive not built or raced mine yet but thats what Ive been shown and seen for myself.
Most cars have a bearing support, and/or some way of tieing the centre shaft to the motor mount so the mesh cant alter..
The pred shaft is only supported at each end in the gearbox with 1 bearing.
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