I carry the same tool as Jon in my Roadster. When I bought my Roadster, the front nearside nut had been overtightened. The symptoms were that it was tight all the way off, and could not be removed by hand, the spanner was needed all the way. I tested the nut on the rear, and it was fine, meaning that the damaged threads were on the hub.
When I upgraded the front brakes, I took the opportunity to replace that hub unit, which I did, and the nut now comes off by hand.
