Heat is a legitimate tool for a seized fastener and it needs handling with more thought than most people give it. Warming a corroded nut expands the metal, cracks the oxide bond between the nut and the stud, and very often lets something move that no amount of force would shift. Used well it is the least destructive method available, because nothing has to be cut or hammered.
Used carelessly it is a genuinely bad idea. There is a tyre a couple of inches away with air inside it and a brake assembly behind the wheel with fluid and rubber seals in it, and both dislike heat considerably. So it goes on in a controlled way, at the nut, briefly, with everything around it shielded, and there are situations where we simply will not use it and reach for an extractor instead. The judgement about which is which is most of what you are paying for.
The key snapping in the socket is the one that surprises people. We come out to the car in N20 with removal kits that bite on the nut body itself rather than the pattern, extract it, and protect the alloy while doing so. Tight in Oakleigh Park, easy in Woodside Park: neither stops the job. Level in Totteridge, sloping in Oakleigh Park: we set the car straight first.

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The High Road through Whetstone is wide and busy and there is no tyre garage on it, which leaves most people with a wheel problem a longer journey than they expected. Doing this where the car already stands avoids that entirely, and the leafier turnings off the main road are usually a better place to work than the A1000 in any case.
Warmth expands the nut fractionally and the oxide bond fails. What was immovable becomes an ordinary nut, without anything being cut or deformed.
Some wheel designs put the nut a long way in and leave nowhere to shield. That is a case for an extractor rather than heat, and we would rather say so than take a chance.
These get found at home the morning somebody needs the car. The vehicle stays where it is, which is a relief on the A1000 where there is nowhere sensible to stop anyway.
In controlled conditions, with the tyre and brake shielded and the heat applied briefly at the nut, yes. Applied casually it is not, which is why it is a judgement rather than a routine.
No. Where the geometry does not allow proper shielding, we use an extraction socket instead. The right answer depends on the wheel.
Not by us. Protecting the tyre and the brake components is precisely why this is done selectively rather than as a first move.
Yes, we cover the full N20 corridor including Totteridge, Oakleigh Park and Woodside Park. Typical arrival is 30 to 60 minutes.
A plain nut of the correct thread and seat, torqued to the manufacturer's published figure rather than to how it feels on the bar.
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