The threads that hold a wheel onto a car are a consumable item almost nobody ever looks at. Every winter they collect salt, every wheel change puts a little more wear into them, and a stud that has sat corroded for four years no longer has a clean spiral on it. In daylight you can see that. At half past two in the morning, working off a phone torch with cold hands, you cannot, and a nut started half a turn out of square will pull itself in and cut a fresh thread straight over the top of the old one.
Cross-threading is why a wheel changed in the dark comes back months later with a stud snapped off in somebody else's workshop. It also produces the other night-time classic, a nut that has been forced up a damaged thread, felt tight at the time and worked loose over the following week. Our answer to it is unglamorous. We work under our own lamp rather than a torch, every nut is started by hand and turned backwards a quarter of a turn first to find the thread, anything gritty gets cleaned before it goes near a stud, and the whole set is torqued in sequence to the figure the car asks for.
The clock does not change the standard. We work by van lighting, wherever the car is stopped, on a driveway in Kilburn Park or at the kerb, and if the tyre cannot be saved you get told at that hour rather than in the morning. Steep camber in the Willesden Lane area? We move a few metres, Brondesbury or anywhere else. Blocked drive in West Hampstead? Open kerb in Shoot-Up Hill? Either works.

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Street lighting along the terraces off Willesden Lane is fine for walking and poor for kneeling beside a wheel, and the bays are tight enough that you are often working with your back to moving traffic. That combination is why so many self-changed wheels in NW6 reach us later with a thread problem attached. If a tyre goes down late, the sensible move is to leave the wheel alone, sit in the car with the hazards on and let somebody arrive with a lamp and a torque wrench. Nothing about the job gets easier for having been started twice.
A driver had changed a wheel themselves on a dark stretch of Willesden Lane and one nut had bitten sideways into its thread. It came off in pieces the next time that wheel needed to move, and the stud went with it.
A car that had stood outside through several winters near Brondesbury had studs packed solid with corrosion. Cleaning the threads took a few minutes and was the whole difference between a wheel torqued properly and a wheel that merely felt right.
A wheel fitted in a hurry elsewhere developed a knock that came and went with speed. Two nuts were sitting on damaged threads and had backed off slightly, which is a fault that gets steadily worse rather than settling down.
It cuts a second thread across the first at a slight angle. The nut will often still go on and still feel tight, because it is jamming rather than clamping. What has been lost is the grip of the full thread, so the nut can back off later or the stud can shear the next time somebody undoes it.
Because you cannot see the thread and you are usually cold and in a hurry. A nut started by hand tells you it is square by spinning down freely. Started with a tool, in the dark, on a stud nobody has looked at, the first sign anything is wrong is when it stops turning.
Usually, once the nut is off and the thread is clean. A chewed or stretched thread has flattened crests and a nut will not run down it smoothly by hand. If we find one, you get told, because it is not something worth leaving until the wheel next has to come off in a hurry.
Every night of the year, with proper lighting rather than whatever the street offers. Typical arrival across NW6 is 30 to 60 minutes, and the car stays exactly where it is parked, so nobody loses a space they queued half a morning for.
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