The plastic cap comes off and the nut underneath is not silver any more. It is a dull grey brown, the splines are packed with something resembling dried mud, and the key drops on and turns without the wheel showing the slightest interest. Nothing has been rounded off. The nut and the stud have quietly become one piece of metal.
Salt does this over several winters. It works under the cap through the gap that always exists, sits against the thread where nothing ever washes it, and the corrosion that forms takes up more room than the metal it replaced. That expansion is what locks the two together, which is why the fault turns up on cars that have covered a lot of gritted road miles and had their wheels off rarely. Heat and brute force are the wrong answers, because a stud sheared off flush with the hub turns a roadside job into a workshop one. Penetrating fluid, time and steady leverage are the right answers, and all three travel with us.
It is worth saying that this is not an unusual call. We come out with the extraction kits to Billington, Grovebury or anywhere in between, get the nut off where the car is standing with the alloy protected, and then deal with the tyre itself. Christmas Day in Planets Estate, any day in Southcott: the line is open. Ring at 3am from Heath and Reach and someone answers; Billington at noon is no different.
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The gritters are out a great deal on the A505 and the A418 through the winter, and salt spray finds the one nut on each wheel that never gets moved. If a wheel will not come away on a driveway in Southcott or at the roadside near Grovebury, that is usually the reason. The extraction kit is carried as standard rather than as something you have to request.
A driver in Linslade had already tried, and the key was spinning freely with the nut untouched. The splines were undamaged. The nut simply was not moving at that torque, and the answer was fluid, patience and a longer bar rather than more speed.
The cap had been on since the car was new and had been letting water past the whole time. What came out from behind it was more corrosion than thread. The nut came away in one piece, the stud survived, and plain nuts went on that corner.
Nothing was wrong with the locking nut until we tried to remove it to fit a new tyre. That is the usual way people find out, which is why the extraction is treated as part of the job rather than a reason to send somebody away.
That is the whole reason for doing it slowly. The extraction gear sits on the nut and not on the wheel face, and the socket is guarded so it cannot drop onto the alloy. Speed marks wheels, and we are not in a hurry.
Very little. A corroded nut is coming off with extraction tools whether the key exists or not, since the key would only spin against it anyway. Losing the key is often how people discover the nut had already seized.
You choose. Plain nuts of the correct type and seat go on as standard, or we fit a fresh locking set if you would rather keep them. Either way the nuts are torqued to the figure published for your car.
Because only one nut per wheel is a locking one, and it is usually the one nobody has touched since the car was built. The other four get moved at every tyre change, which keeps the thread clean enough to work.
That is the intention. Removing the nut is not a separate appointment, it is the obstacle standing in front of the actual work. Once the wheel is free we carry straight on and fit the tyre you originally rang about.
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