Well, the conversion is on. Got the gear from Just engines yesterday, and started fiddeling today. Fixing the hall sensor to the crank case got me thinking though. How thick is this material? I certainly don't want to risk drilling away into the front bearing! I'm planning on going with M3 screws to fix the sensor to the crank case. The drive hub on the 200 is not exactly ideal for mounting a magnet either. Hopefully it's doable, I don't want to make a custom one unless I really have to.