Old 09-30-12, 10:33 PM
  #6  
Jeff Wills
Insane Bicycle Mechanic
 
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Since you mention a Shimano 600 Arabesque, I'm thinking this in 1-inch threaded systems.

Make sure both headsets are the same. Headsets of that era came in JIS and ISO standards, and they aren't interchangeable. I once had an Eisentraut frame handed to me that had been built for a JIS headset and had an ISO headset crammed into it. The headset cups didn't fit, had expanded the head tube, and ruined the frame.

http://sheldonbrown.com/cribsheet-headsets.html
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