Thought this might be interesting. I had to extract a stem from steerer on an early 80's Columbine. The prior owner buggered up the Campy SR headset obviously not knowing what they were doing. Well, I did what you all would do to extract a stuck stem and after a few whacks it came loose. Since the HS was loosened, I thought I'd clean it out and re-grease and adjust it. As I had the fork out, I noticed a bulge where the wedge would have been. It took me about an hour to get down to a bulge of around .004-.005" and I felt like that was close enough - until I didn't. I took another run at it and it's now within a few thou variance like the rest of the tube. The HJ crown was also drilled off center as you can see in the 3rd photo. I'm sure this was done to take an internal/modern brake nut. I'll chuck this up in the mill and enlarge it and then make a shim that sits in there straight. There are other issues....
Initial measurement:
Fixing a bulged steerer tube. by
Duane Draper, on Flickr
You can see how my blocks took a bit of a beating as I rotated the fork and clamped down on the bulge.
Fixing a bulged steerer tube. by
Duane Draper, on Flickr
Showing it who is boss. The wood was so soft, it didn't damage the paint around the crown.
Fixing a bulged steerer tube. by
Duane Draper, on Flickr