hi does anybody have any idea what the air gap tolerances are for the ABS sensors on the rear drive shafts, I have one slightly corroded which is pushing the ring out in one spot causing it to catch the sensor slightly, don't want to pay for a repair as thinking of selling and was wondering if I could spacer sensor from hub with a very thin (less than 0.5 mm) washer until i decide whether i am keeping the car much longer.