The little plastic cap that clips over a locking nut is there to make the wheel look neat. It also makes an excellent cup. Water gets in past it, settles in the recess between a steel nut and an aluminium wheel, and nothing ever dries out because the cap is holding it in. Two different metals, road salt and a permanent film of water is the recipe for corrosion, and the white scale it throws off takes up room. The key still slides in while everything is dry. It will not go near the splines once they are packed.
Which is why these calls tend to start with a wheel that came off fine last spring and will not come off now. Nothing was done to it in between. It just sat. The cars we see this on live at the kerb around Sutton Common and Benhilton, out in every gritted winter, never on a driveway. Getting the nut out means cleaning the recess first, picking a tool that genuinely reaches the bottom, and winding it out steadily instead of shocking it, which is what shears studs.
The key snapping in the socket is the one that surprises people. We come out to the car in SM1 with removal kits that bite on the nut body itself rather than the pattern, extract it, and protect the alloy while doing so. Level in Cheam, sloping in Rosehill: we set the car straight first. Underground parking in Rosehill or Benhilton is worth flagging. The SM1 postcode and a street in Benhilton: that is enough.

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Most of the cars we take locking nuts off here have never had a driveway. They live on the street in SM1, get gritted road water thrown over them all winter, and only get looked at when a wheel has to come off. Driving to a fitting bay with a wheel you cannot remove achieves very little, since the first thing anybody there will do is try the same key that has already failed you.
A wheel that had not been off since the car was bought. The recess was full of scale and the key would only go halfway down. Cleaned out and gripped properly, the nut came out whole and a plain one went back.
Being unable to get a wheel off on a busy road is worse than the puncture that caused it. We came to the car where it had stopped, extracted the nut there, and dealt with the tyre on the same visit.
Seasonal swaps stall on one seized nut more often than on anything else. Booked ahead, in daylight, at the kerb outside the house, it is a calm half hour rather than a crisis.
We tend to leave them off, or refit them with a smear of grease on the nut underneath. They keep the wheel tidy and they keep the water in. A nut you can see and clean occasionally is a nut that comes off.
Almost always, if it is done slowly. The risk comes from impact tools and long bars used in anger on a corroded thread. Heat, penetrating fluid and steady pressure shift nuts that a rattle gun would have snapped off at the hub.
Yes. The car stays where it is parked and we work at the kerb with the wheel on the hub, taking up no more room than a car with its bonnet up. If the bay is tight we work from the pavement side.
Common, and not a problem. We do not need the original key to get the nut off. Afterwards you choose between plain nuts on that corner or a whole new set, and either way you leave knowing where the key is.
Yes, with the code recorded so another can be ordered if it wanders off. Most people who have just been through this decide the security is not worth the bother and go for plain nuts, which is a perfectly reasonable answer.
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