Doesn't always work. I had a Thor alloy locking bolt attacked by a maniac with an airgun changing one of my tyres. I was having a smoke at the time - smoking kills alloys!
I took it to 4 garages and all of them mangled their bolt extractors. I ended up taking it to an engineering shop who saw the problem as a challenge. After working on it for 5 hours with an array of welding gear they couldn't get the bolt off.
They managed to save the hub but the alloy they had to cut to pieces to get the bolt out.
Solution - don't use locking wheel bolts ever. And go to a place you know that refuses to have airgun things on their premises.
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