Reducing the butting in a head tube

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ProCreateful

I've just got my hands on a LeMond Alpe D'Huez, 853 steel 57cm etc. There is currently a appears to be a 1" headset, but the butted walls where the cups fit are really quite thick whilst the main tube is considerably larger. I was wondering if it was at all possible to take out 3mm of the butting in order to accommodate a larger 1 1/8" headset. This may be a really stupid question, but my older Raleigh frame has a straight gauge head tube and I've never had any issues with flex etc. As to why I'd want to do this, simply I have a bunch of 1 1/8 carbon forks which I'd like to utilize, otherwise I'm looking at some Columbus minimal's which are 150+

Cheers,
Joe

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freezing77 in reply to @ProCreateful

May be fairly simple using an expanding reamer of a suitable size. This would be fairly laborious but also a fairly safe way of doing it.
I suspect while machining it would be the quickest way, it may not be cost effective taking into account the need to make some sort of jig to hold the frame.

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