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coppiThat
Sorry for the dredge!
Upgrading/re-vamping a Brompton, had read this thread before and enjoyed it. Upon trying to do it myself I suddenly realised how many little issues you've overcome.
Mdcc mentioned a problem early on with the chainset using non standard bolts, was this overcome with the modification of the larger chainring?
I currently have a 24mm axle carbon chainset that I was looking to use but I'm getting mixed reviews on external bb's and their compatibility with bromptons - did you know if this is possible?
The other option I had was to get a campag double chainset but was unsure I'd be able to machine the same solution as you've been able to.