Black magic or he used one of these Steerer Thread Clearing Tool with Die
2269a For 1" £55.78
http://www.framebuilding.com/economy%20workshop%20and%20framebuilding.htm many bike shops should beable to do it for you.
@TheBrick(Tommy) started
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Black magic
or
he used one of these
Steerer Thread Clearing Tool with Die
http://www.framebuilding.com/economy%20workshop%20and%20framebuilding.htm many bike shops should beable to do it for you.