Seems better to get a braze on front derailleur then use an adapter if you need a clamp on. Seems more versatile in the long run. Is that correct or am I missing something?
Parlee make and sell an after market carbon FD braze on adaptor in various sizes to suit seat tubes. It has a 1 bolt fixing for braze on FD and the clamp itself. Doesn't react with metals, paint, doesn't damage paint and is non corrosive. Very strong and simple. Install is a breeze using a torque wrench and carbon assembly compound. Not cheap though and weighs 11gm with the bolt. $95 from Parlee and $70 if you shop around.
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