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I just checked the two I need to adjust, they're both 32mm. But yeah, the fact that they're all different (everyone loves how often the bicycle industry changes standards) is why I wanted an adjustable one. But I don't think I'll be owning a 1 1/8" threaded 36mm headset any time soon and if I am I guess I'll just borrow a tool
and yes, I got it to work before I saw your comment :)
Broken links aside, you will find that not all headsets are the same size. If you want a pin spanner then I actually would recommend the park one purely because the springiness of it keeps it in place slightly/allows for slightly different sizes.