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@gbj_tester
As discussed previously, it really should be all but impossible to break a seatpost that heavy unless the design is inherently poor. Normal manufacturers put all the material as far from the axis as possible.
Claimed weight (using Italian scales) is 265g for a 27.2x270, a Thomson cut to the same length would be 211g. If you wanted to make a Thomson that heavy, you'd need to increase the wall thickness of the shaft by about 50%