A couple of weeks ago (BFC) I recall someone asking the best way to remove later braze ons (dare I say, including a derrailleur hanger). I have a similar dilemma and was surprised there were no replies on the group and wondered what the consensus was grind them or burn 'em or will it cause irreparable weakening btw when finished it will have one brake. as in the original 1952 catalogue...
Thanks
Ken Foster
Eastbourne
England