Wheel Nut Fail

So went to take a wheel off today and found that my 19mm socket wouldn't fit over two of the nuts. Used a larger one on one of them and found that the domed bit came away (jammed in the socket) leaving an 18mm nut behind. That came off as you would expect.



Second one wasn't so easy. The domed bit would spin on top of the rest of it, but wouldn't come away, had to destroy it with a chisel and pull the remnants off with pliers!



The nuts that were left behind looked a little corroded, so I would guess that some water got between the cap and the nut, causing the dome to swell.



Anyone else come across this before?

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