Cutting down a steerer tube...

Hi, this page comes high in the Google results for "steerer thread die" so I thought I'd post some advice I found from the late great Sheldon Brown. On this page he says

Sometimes, the threads on the fork's steerer tube need to be cleaned up. In this case, you need a die. One way to make such a die is to use an old, worn out headset race. Headset races are made from hardened steel, just like dies, and you can make a headset race into a tap by cutting grooves in it with a carbide-tipped hacksaw blade.

I just need an extra 1/2" or so of thread so I'm going to try that.

Cheers, al.