I've been told in the past that cutting into an aluminium steerer (presuming the steerer is ally not steel) is a recipe for disaster, presumably because aluminium has a lower fatigue strength than steel.
extending threads into a steel steerer is different, although that's difficult enough as it's not that common anymore so the dies that people have are not as sharp. lee cooper told me he could extend the threads on my fork 'at my own risk'...
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