most common cause of this is a rusty backplate has damaged the magnetic ring on the rear bearing. Rear bearings are not difficult to replace. you are best to change the backplate whilst you are in there if it is poor condition. It could be that it is just the sensor but more likely the bearing
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Dave...
Lost a few stones  and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident
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