I'd try posting in C&V. Those guys have seen all kinds of old wierd stuff. If you don't care about the finish on the headset parts, you could try using a channelock wrench and / or Visegrips.
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What, Me Worry? - Alfred E. Neuman
I'd like to think i have as much money as brains.
I see the light at the end of the tunnel, but the tunnel keeps getting longer - me