The bracket that holds the Sensor onto the block looks like it can slilde on the bolts slightly each way,, the holes in the bracket arent perfectly circular they are a little longer which would allow the bracket and sensor for that matter to not be at exactly TDC if its not in the right spot i would imagine...

also just for educational purposes only what is the purpose of the sensor mounted on that little bracket,, how does it work, what does it affect?