One odd thing about working with bamboo is that no matter how straight you think the cane is, it always has some sort of linear distortion. This is especially true in my home-grown culms that come from up the river a piece. There is always a major distortion axis, and then a secondary axis of distortion that leaves me wondering if I've gotten the alignment right at the end. In this case, the seat tube bends mostly in the fore-aft direction, but also has a slight deviation left to right, which makes the seat tube a little off center at its midpoint, even though it is perfectly centered at the seat collar and BB junctions. My bet, I'll never notice it once I am astride the bike.
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