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Ah, I see. What you're saying makes complete sense. Quite a big project! There is some speculation that the frame may have been built by the great Robert Ducheron for André, which would make it a one off, perhaps. The head tube lugging looks similar to another Ducheron I've seen online and is completely different to anything I've seen elsewhere. Another André was my only comparison, but you have clearly spotted more details than I have.
Do you have an opinion on seatpost expanders? Is it ok? Ot too hard to comment on. Beginning to think it might be best to leave alone...
Hornsweep
@M_V
Did it definitely start off looking like the black one?
I can’t see the bottom of the lug on the blue frame which makes me think the construction is a bit different.
It’s difficult to know what needs doing/will work without really knowing what’s been done and to know that it probably wants the paint removing.
To get it as true to the black one as possible it probably wants the lug replacing which isn’t an easy job if you want to keep the top tube and down tube intact*.
Pulling a tube out of a lug is alright, pulling a lug off two tubes simultaneously is a much harder task involving more heat and is something I’ve avoided ever undertaking.
You also have to deal with the seat stays, which looking at them again look quite different between the frames, on the black one the taper seems longer and the cap over hangs a bit, on the blue one they seem stubbier and there’s no over hang. Again, would suggest the two frames never started out identical.