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@Irishane
It belongs to guy that just arrived from San Diego, not a brakeaway just something he and a welder knocked together before leaving! They put a thinner tube inside the downtube after cutting it in half;
lined it up and drilled holes for the bolts,
cut slots in the other side to allow for movement
and fabricated this custom coupling plate
Then they added the second seatpost clamp and a poor mans travelling bike was born! Apparently the seatpost just helps line things up and doesn't suffer much more load/force than usual.
It rides like a dream, no creaks, cracks or anything strange so far. We'll see how it holds up with shitty Oslo streets and polo to deal with.