Sir Neil d'Menture
Retro Guru
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This will be little consolation to you but I had the same problem with a frame that I restored.I had an issue with the new headset being too high for the steering tube and tried a few options so I could keep the Dura-Ace 7410 headset. This sadly didn't work, so resorted to something with a shallower stack hight.
I decided that I wasn't going to be beaten so I bought another set of threaded forks. After some careful measurements I cut both sets of forks so that the top piece from the new set was longer than the old piece. Then I got a length of steel tubing which surprisingly enough comes in a standard size to fit inside the steerer. This gives support which you don't get welding the two ends together. Then the hard bit was finding a TIG welder - must be TIG welded due to the steel specification. I gave him the offcuts to set his machine up with and then he welded to two parts together. Cost me £20 plus a cheapo set of forks from the bay.
Cost me far more than it was worth but OCD rules and I could have a matching headset.
Somewhere on here is a you tube video of the whole process.