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any more info on that?
A perfect band clamp has uniform radial pressure. As band clamps are imperfect, they tend to produce peak radial pressure at the screw termini, adjacent to the slot. To resist this, you should put the slot in the band clamp on an uninterrupted section of the tube, as this will resist deformation under the abnormal load better than the unsupported edges of the tube slot.
I hear this for the first time, any more info on that? I always thought the slot on the seattube should align with the slot on the clamp.