the reason why engineers don't make good doctors is exemplified below.
drove to the shop yesterday on the way i get a knocking in what i thought was the driver side wheel gear so i gets home because it was bad and come on all of a sudden, whipped the driver side wheel off, inspected all the ball joints and bushings i was expecting to find problem with the wheel bearings if not the rubber bits, but nothing i'm really annoyed by this point, so i go to take the other side wheel off and right in front of my face was a massive bolt head screw in the tyre lol the head was that big it was causing a knocking coming up through the steering , a doctor would of spotted that straight off the bat, damn bolt was huge, my tyre as good as ate it.