1 1/8" forks in a 1" headttube, have a look at my IS41 adaptor and let me know what you think!

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jetski

I think I'd want the target circle to be R<50μm

Well ok, so you propose less than 0.05mm. Anyway, we'll see how it goes.

I just realized I could also simply braze on the cups (if machined from steel) and THEN apply a IS41 facer+reamer. Then everyone should be happy?

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gbj_tester in reply to @jetski

I just realized I could also simply braze on the cups (if machined from steel) and THEN apply a IS41 facer+reamer

That's the correct order of operations. Of course, you could also use the same tool to tweak in the pressed-on aluminium cups if you leave some stock on the inside to allow for the finish cut to be done in situ.

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