I only filed mine down after testing it Glenn. The voltage changes from 0.7V to 1,7V as the reluctor segments pass the sensor. When tested in situ my sensor was missing the odd segment, but off the car with the sensor in one hand and the bearing in the other it read every segment when the two were held close together.
Have a good look at the backplate where the sensor mounts and clean off any rust that has lifted that will prevent the sensor from seating correctly.
I wouldn't file the sensor bracket down unless you are 100% sure that will cure the problem.
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