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@broken_777
you can safely extend a thread but only say like an inch maximum and not on chromed steerers. But it really kills the die on the thread cutter which is made purely for chasing them threads
as for cutting a thread into ahead steered - No. unless you have an industial big machine thread cutter.....i have seen fork at which someone was trying to extend the threads more than say 1 cm and he managed to make it too deep so the threaded area was like a hourglass thick at the top narrower at the middle and thick on the end again......result...forks fukked....unless you take it to a framebuilder to have the old steerer debrazed and brazed on a new one